Letter box

This article is about boxes for depositing letters. For video framing, see letterbox. For the type of interprocess communication, see MailSlot.
A black front door located on an old red brick building. There is a letter slot built into the door approximately 3 feet or 90 centimetres from the bottom.
A mail slot letterbox, located in the middle of the door.

A letter box, letterbox, letter plate, letter hole, deed, mail slot, or mailbox is a receptacle for receiving incoming mail at a private residence or business. For the opposite purpose of collating outgoing mail, a post box is generally used instead.

A cast-iron mail slot letter box

Letterboxes or mailboxes consist of four primary designs:

Styles and usage

A 'letter box', or 'mail slot' in American and Canadian usage, is a slot, usually horizontal but sometimes vertical, about 30 cm by 5 cm (12 inches by 2 inches), cut through the middle or lower half of a front door. This style is almost universal in British homes and offices, but in the US is limited primarily to older neighborhoods in a few eastern cities. Most are covered by a flap or seal on the outside for weatherproofing. The flap may be closed by gravity, or sprung to prevent it opening and closing noisily in the wind. Some letterboxes also have a second flap on the inside to provide further protection from the elements. There may also be a small cage or box mounted on the inside of the door to receive the delivered mail. Mail slots are limited to receiving incoming mail, as most have no provision for securing and protecting outgoing mail for pickup by the mail carrier.

A black rectangular mailbox attached to the outside of a house. There is a doorbell above and to the left of the mailbox.
An attached or wall-mount letterbox.

Wall-mounted or attached mailboxes may also be used in place of mail slots, usually located close to the front door of the residence. They are known as full-service mailboxes, since most have provisions for securing outgoing as well as incoming mail. Attached wall-mounted mailboxes are still used in older urban and suburban neighbourhoods in North America. They are especially common in urban and suburban areas of Canada, where the curbside mailbox is rarely seen except in rural areas. Attached mailboxes are less common in newer urban and suburban developments and in rural areas of the United States, where curbside delivery or delivery to a community mail station (cluster mailbox, known as a bank of post boxes in the UK) is generally used.

Rural and some suburban areas of North America may utilize curbside mailboxes, also known as rural mailboxes. These receptacles generally consist of a large metal box mounted on a support designed primarily to receive large quantities of incoming mail, often with an attached flag to signal the presence of outgoing mail to the mail carrier. In the U.S. and Canada, rural curbside mailboxes may be found grouped together at property boundaries or road/driveway intersections, depending upon conditions. Although the United States Postal Service (USPS) has general regulations stating the distance a letter box may be from the road surface, these requirements may be changed by the local postmaster according to local environment and road conditions.[1]

At one time, nearly 843,000 rural Canadian residents used rural (curbside) mailboxes for private mail delivery, though Canada Post has since required the installation of community mailbox stations for many rural residents.[2]

In the U.S., wall-mounted or curbside mailboxes that are only designed for receiving incoming mail are known as limited-service mailboxes, while mailboxes equipped with a mechanism for notifying the postman to collect outgoing mail from the mailbox are known as full service mailboxes.

A number of designs of letterboxes and mailboxes have been patented, particularly in the United States. One design was the visible mailbox (because it was made of transparent glass) with a flip-up aluminium lid produced during the first part of the 20th century by George F. Collins of the Barlet-Collins Glass Company in Sapulpa, Oklahoma.[3][4]

Letter box standards and construction

Community letter box station in France

Europe

The European standard for letter boxes, EN 13724:2002 "Postal services – Apertures of private letter boxes and letter plates – Requirements and test methods", replaces earlier national standards such as BS 2911:1974 "Specification for letter plates" or DIN 32617. It specifies among other things:

This Standard is voluntary. It was developed by a German mail boxes manufacturer Burg Wächter and it reflects this manufacturer's technical capability and commercial interests with a number of the specifications unfounded, for example, aperture dimensions or internal volume, while the vital issues of security, energy saving, and environmental issues of a property and the occupants are not addressed in the Standard.

Although the Standard was due for a review after 5 years in 2007, this did not happen. In April 2013 the amended Standard BS EN 13724:2013 was finally published, however, again it was drafted by the same company and is nearly word-for-word copy of the old EN 13724:2002 Standard. The essential amendments (especially important for the UK) were not included again and the interests of security, energy saving and wellbeing of the public were not addressed.

Canada

For those neighbourhoods where mail delivery to a mail slot is still provided, mail slots must have an opening not less than 17.5 cm by 4 cm, and must be located in a front door or adjacent panel not more than 125 cm and not less than 60 cm from the finished floor line.[5] Wall-mounted mailboxes equipped with a slot must have a slot opening measurement not less than 13.5 cm by 4 cm and the slot located on or near the top of the box.[5]

Curbside mailboxes, known in Canada as rural mailboxes, must be weatherproof, have space for the name of the mailbox owner, and possess a signal device on the right-hand side (when facing the front of the mailbox) for pickup of outgoing mail.[5] The signal device must rise above the mailbox and be visible at a distance, and must not obscure the mailbox owner's name or impede vehicular or pedestrian traffic.[5] Canada Post requires all rural mailboxes to have a minimum interior dimensions of 45 cm in length by 17.5 cm in width by 17.5 cm in height for a rectangular mailbox, and 45 cm in length by 25 cm in diameter in the case of a cylindrical mailbox.[5]

United States

A plastic mailbox in Jacksonville, Florida, USA

In the U.S.A., the U.S. Post Office first established guidelines for mail recipients, including mail slot or mailbox size, location, and identification requirements.[1][6] While the Post Office permitted alternative designs for attached mailboxes and mail slots that met basic size and construction requirements, the same was not true for curbside mailboxes, which postal regulations required be in the form of the traditional dome-rectangular or 'tunnel-top' design first established in 1915. In 1978, seven years after the establishment of the U.S. Postal Service, U.S. postal authorities at last approved a "contemporary" mailbox specification for alternative designs.

Currently, U.S. curbside mailboxes are classified as (T) Traditional, (C) Contemporary, or (L) Locking.[7] Traditional or Contemporary non-locking curbside mailboxes are approved in three sizes - No. 1, No. 2, or No. 3, measured by minimum interior dimensions.[7] The largest acceptable curbside mailbox is the No. 3, which measures 22.81 inches long, 11 inches wide, and 15 inches in height (58 cm x 28 cm x 38 cm) at the peak.[7] Locking mailbox designs that provide security for the recipient's incoming mail have fewer restrictions on shape and size, though designs with a slot for incoming mail must be at least 1.75 inches high by 10 inches wide.[7] Residential locking mailboxes cannot require the postal carrier to have a key, by USPS Specifications.[8] Therefore, no USPS approved residential locking mailbox has secure outgoing mail. Installation requirements vary from standard unlocked mailboxes: with locking mailboxes, the incoming mail slot must be 41"-45" above the roadside surface, and the front of the mailbox must be 6"-8" back from the curb.[9] USPS specifications for all mailboxes mandate the same, except the placement of the 'incoming mail area' varies with a locking mailbox.[10]

Environmental considerations

External or curbside letter boxes are not temperature-controlled and can sometimes be a concern for temperature-sensitive products such as pharmaceuticals. Conditions can include high and low temperatures outside of the recommended storage conditions for certain products. For example, the US found the temperature in a steel mailbox painted black could reach 136 °F (58 °C) in full sun while the ambient air temperature was 101 °F (38 °C).[11]

Security

There is a recommendation to have a lock on the letter box if not built into a lockable door. Unlocked letter boxes are often used for identity theft, ordering something valuable, which is then stolen from the letter box.

History

A 19th-century slot letterbox in the town of Wormgate, Lincolnshire UK

Europe

Private letterboxes or mail slots did not become popular in most of Europe until the mid to late 19th century, although they were used in Paris from the late 18th century.

In 1849, the Royal Mail first encouraged people to install letterboxes to facilitate the delivery of mail. Before then, letterboxes of a similar design had been installed in the doors and walls of post offices for people to drop off outgoing mail. An example of such a wall box (originally installed in the wall of the Wakefield Post Office) is dated 1809 and believed to be the oldest example in Britain. It is now on display at the new Wakefield Museum.

North America

In 1863, with the creation of Free City Delivery, the U.S. Post Office Department began delivering mail to home addresses. Until 1916, U.S. mail carriers knocked on the door and waited patiently for someone to answer.[12] Efficiency experts estimated that each mailman lost over 1.5 hours each day just waiting for patrons to come to the door.[13] To correct this problem, the U.S. Post Office Department ordered that every household must have a mail box or letter slot in order to receive mail.[12] Slowly, homeowners and businesses began to install mail slots or attached mailboxes to receive mail when they were either not at home or unable to answer the door.

U.S. Rural Free Mail Delivery to curbside mailbox, circa 1905

As early as the 1880s, the U.S. Post Office had begun to encourage homeowners to attach wall-mounted mailboxes to the outside of their houses in lieu of mail slots. Mounted at the height of a standing man, attached mailboxes did not require the mail carrier to lean over to deposit the mail. They also allowed the homeowner to keep outgoing mail dry while awaiting pickup by the mail carrier.[12]

To reduce the time required for the mail carrier to complete delivery when the front door of a home was located some distance from the street, it was proposed that individual mail boxes for residential or business customers be mounted curbside on fence-posts, lamp-posts, or other supports. While this idea was rejected for city mail delivery, it was adopted for rural areas. Curbside mailboxes located on a rural route or road and sited at the intersection of the road with each recipient's carriageway or private drive allowed limited numbers of mail carriers to deliver mail to many widely scattered farms and ranches in a single day using horse-drawn wagons or later on, motor vehicles.

Before the introduction of rural free delivery (RFD) by the U.S. Post Office in 1896,[14] and in Canada in 1908,[15] many rural residents had no access to the mail unless they collected it at a post office located many miles from their homes or hired a private express company to deliver it. For this reason, mailboxes did not become popular in rural North America until curbside RFD mail delivery by the Post Office was an established service. Even then, farmers and rural homeowners at first resisted the purchase of dedicated mailboxes, preferring to leave empty bushel baskets, tin boxes, or wooden crates at the roadside for the postman to deposit their mail.[13][14] Not until 1923 did the U.S. Post Office finally mandate that every household install a mailbox or mail slot in order to receive home delivery of mail.[13]

Joroleman curbside mailbox with red semaphore flag. When raised, the flag indicates outgoing mail.

Originally designed only for incoming mail delivery, curbside mailboxes were soon fitted with a semaphore or signal flag mounted on an attached arm to signal the postman to pickup outgoing mail.[14] Originally, this flag was raised not only by the resident of the property to signal the postman of outgoing mail, but also by the postman to inform the recipient that incoming mail had been delivered - a convenience to all during periods of freezing or inclement weather.[16][17]

In 1915, the familiar U.S. curbside Joroleman mailbox, named after its designer, U.S. Post Office employee Roy J. Joroleman, was approved by the Post Office.[14] Joroleman, who retained a degree in mechanical engineering, designed his mailbox with an unusual dome-rectangular shape, incorporating a curved, tunnel-shaped roof, latching door, and rotating semaphore flag.[14][18][19] The Joroleman mailbox has been praised as a manifestation of American functionalist industrial design.

Constructed of light-gauge painted sheet steel, Joroleman designed his mailbox with an arched, tunnel-shape roof, which prevented excessive accumulation of rainwater or snow while resisting deformation. The tunnel top also simplified the process of mass production by eliminating the need for precise sheet metal bends. Stamped and formed metal straps riveted to the arched opening and the mailbox door served as a door latching mechanism, while a rotating red semaphore flag mounted on a shaft attached to the side of the mailbox served to signal the approaching mailman if there was outgoing mail inside. Fitted with a crimped or braze-on rear steel panel and a false floor to keep its contents dry in inclement or humid weather, the Joroleman mailbox required only two rivets, three axle bolts, and four screws and nuts for completion. Durable and inexpensive, the popularity of the Joroleman mailbox was further enhanced by a decision not to patent the design, but to make its specifications known to all potential manufacturers for competitive sale.[14] Adopted across the United States, it has remained the top-selling mailbox since its introduction, and was also widely used in Canada prior to that country's decision to eliminate individual curbside delivery to rural residents.

The Joroleman mailbox was originally approved for manufacture in one size, the No. 1, which could accommodate letter mail, periodicals, newspapers, catalogs, and small parcels.[14] After July 1, 1916, the Joroleman mailbox would be the only design approved by the Post Office for new curbside mailbox installations. In July 1929, the Post Office approved specifications for a larger Joroleman mailbox known as the No. 2.[14] The No. 2 mailbox, soon followed by the still-larger No. 3, could accept larger parcels and packages sent via Parcel Post; these large boxes proved particularly popular with rural mail recipients, who could order manufactured goods by mail for delivery to the farm or ranch.[14]

Since 1923, in order to promote uniformity, as well as the convenient and rapid delivery of the mail, the United States Post Office Department, (later the USPS) has continued to retain authority to approve the size and other characteristics of all mail receptacles, whether mailboxes or mail slots, for use in delivery of the mails. The USPS continues to issue specifications for curbside mailbox construction for use by manufacturers. Approved mailboxes from the latter are always stamped U.S. Mail and Approved by the Postmaster General. These standards have resulted in limitations on product diversity and design, though new materials, shapes, and features have appeared in recent years.[1][18]

After World War II, postwar suburban home construction expanded dramatically in the United States, along with mail volume. By the 1960s, many new suburban homes were considerably larger and located on larger lots, yet most still used mail slots or attached wall-mounted mailboxes. This development caused a substantial increase in distances walked by the mail carrier, slowing mail delivery while increasing labor costs. In order to reduce delivery times and increase efficiency, the Post Office began requiring all new suburban developments to install curbside mailboxes in place of door-to-door delivery, allowing mail carriers to remain in the vehicle while delivering the mail. In 1978, the USPS (successor to the Post Office) declared that every new development must have either curbside delivery or centralized mail delivery.

Recent developments

A number of letterboxes beside an electronic keyreader. A hand is holding an electronic key up to the reader, and one of the boxes is automatically opening.
An automated-opening letterbox mail station for an 'intelligent' apartment building in Falun, Sweden

Europe

Sweden

KopparStaden AB, a housing cooperative in Falun, Sweden, has begun to install centralized mail stations with individual letterboxes using electronically operated doors in its buildings.[20]

UK

A letter box is an established opening element of an entrance door in the United Kingdom for undisrupted mail deliveries but it is a sizeable hole in the exterior door. It is the only part of a property that is publicly accessible 24 hours a day and exposes the premises and its occupants to all four main risks defined by the Insurance industry: from fire, water damage, malicious damage and weather-related damage.

A new design of letter box was unveiled by British innovators at the International Firex exhibition in 2007.[21] The design, which is based on using gravity, can mitigate letter box related risks, such as arson, burglary, mail theft, flooding and heat loss.

North America

Numerous designs of mailboxes with improved construction and/or security have been patented in recent years, particularly in the United States.[22] In 2001, the USPS first approved designs for locking curbside mailboxes to stem a rise in identity and mail theft.[1] With these secure designs, the incoming mail is placed into a slot or hopper by the mail carrier, where it drops into a secure locked compartment for retrieval by only the homeowner (who retains a key or combination to the lock). Locking mailboxes are generally constructed of heavy-gauge steel or aluminum plate, though some models are made of roto-moulded polymer plastic.[18]

Because of the increased risk of vandalism to curbside mailboxes, numerous vandal-resistant boxes made of composite plastic or heavy-gauge steel or aluminum plate have also entered the market. Some composite mailboxes made of resilient polymer plastics and mounted on ground spikes can resist severe impacts from baseball bats or even being run over by a vehicle.[18]

In 1978, steady increases in postal service costs caused the USPS to insist on either curbside or centralized mail delivery for new suburban neighborhoods and developments.[23][24] A 1995 cost delivery study published in a USPS Operations handbook listed per-address annual delivery costs as: Door-to-door, $243; Curbside, $154; Cluster Box (centralized mail delivery), $106.[25][26]

With centralized mail delivery, a central community mail station consisting of multiple mailboxes is located within or near a building or in a particular neighborhood. Known variously as group mailboxes, cluster mailboxes, or community mail stations, these mailboxes are often used in newer construction in place of door-to-door or curbside mailbox delivery.

Rural Community Mail Box (CMB) Station in Canada

In Canada the community mailboxes (or Supermailboxes) appeared in the late 1980s in newer suburban areas. Newer developments usually are temporarily supplied with green rural community mail boxes and replaced later with permanent supermailboxes.

Since 2004, many rural Canadian residents have been required to use community mail stations (known as a Community Mail Box, or CMB) instead of individual curbside mailboxes in an attempt to reduce health and safety complaints by Canada Post rural mail carriers.[2][27] This change has been extended to some suburban areas of the country as well.[28][29][30]

A USPS CBU Mail Station

In the U.S., a property with a single mailing address but with multiple mail recipients may utilize a community mail station designated CBU, or Cluster Box Unit. CBUs are typically stand-alone units that have locked individual compartments each tenant in an apartment building, a trailer or mobile home park, or an office center.

In recent years, the USPS has insisted upon centralized mail delivery in virtually all newly constructed residential housing developments, condominiums, and gated communities by requiring or incentivizing the builder or developer to install larger NDCBU (Neighborhood Delivery Collection Box Unit) stations. CBUs and NDCBUs are both commonly known as cluster mailboxes. The NDCBU is a centralized community mail station with compartments for the centralized delivery of mail to multiple recipients at multiple addresses within a single neighborhood development or community.[31] In new housing developments, the NDCBU location is fixed by the developer, not the USPS, and may be located hundreds of yards away from the addressee's actual residence.[28][32] A parcel locker for receipt of packages and a separate compartment for outgoing mail are usually built into the station.[33] The mail carrier will have a key to a large door on one side that reaches all the compartments, and the residents or tenants will each have a key to the door into their individual compartment on the other side. The location of the NDCBU in a community or business center is extremely important, since neighborhood cluster box installations located in remote or poorly lighted areas invite large-scale mail theft or vandalism.[32][34][35][36][37][38][39][40][41] Even when located in a high-traffic location or inside a gated community, the NDCBU is a tempting target for thieves attracted by the possibility of recovering checks, cash, identifying information, or other valuables from multiple victims.[31][32][34][36][38][39][42][43] A 2008 RAND Corporation study, citing USPS statistics collected between 2004 and 2007, found that NDCBU thefts constituted 52.7% of all U.S. urban neighborhood mail thefts and 76.6% of all rural neighborhood mail thefts from locations with more than one mailbox, with higher-income ZIP code zones having a substantially higher number of thefts than low-income ZIP code zones.[44]

Australia

Home Parcel boxes are being used in Australia to facilitate the delivery of parcels ordered over the internet as the letter box declines in use due to emails. Special locking mechanisms with dynamic codes are being used to create a new lock code on every delivery, ensuring greater security from petty theft. These lock codes are accessed by the delivery company using their barcode scanner and a standard barcode or QR code.[45]

References

  1. 1 2 3 4 Postal Service, Code of Federal Regulations 39 CFR Part 111, Standard 7A, Mailboxes, City and Rural Curbside, February 8, 2001
  2. 1 2 Denley, Randall, Canada Post set to deliver fatal blow to rural mail service, The Ottawa Citizen, 3 May 2008, retrieved 26 January 2012 from Canada.com
  3. ↑ City Free Delivery mailbox, National Postal Museum (retrieved 13 February 2012)
  4. ↑ Visible Mail Box, Antique Perfection (retrieved 13 February 2012)
  5. 1 2 3 4 5 Canada Post, Mail Receptacles Regulations SOR/83-743: Regulations Respecting the Delivery of Mail To And the Collection Of Mail From Certain Mail Receiving and Dispatching Facilities, Canada Post Corporation Act, Department of Justice, 15 September 2006
  6. ↑ "US Postal Customer guidelines". Pe.usps.gov. Retrieved 2012-09-19.
  7. 1 2 3 4 U.S. Postal Service Standard Mailboxes, Curbside, U.S. Postal Service STD-7B01, retrieved 8 February 2012
  8. ↑ "Mailbox FAQ". MailBoss.com. Epoch Design. Retrieved 14 June 2013.
  9. ↑ "USPS Specs". MailBoss.com. Epoch Design. Retrieved 14 June 2013.
  10. ↑ "Mailbox Guidelines". USPS.com. USPS. Retrieved 14 June 2013.
  11. ↑ Black, J. C.; Layoff, T. "Summer of 1995 – Mailbox Temperature Excurions of St Louis" (PDF). US FDA Division of Drug Analysis. Retrieved 12 July 2011.
  12. 1 2 3 Household Mailboxes, National Postal Museum, retrieved 8 February 2012
  13. 1 2 3 Marsh, Allison, Household Mailboxes, National Postal Museum
  14. 1 2 3 4 5 6 7 8 9 Bruns, James H. (July–September 1996). "Soap boxes won't do". EnRoute. National Postal Museum. Archived from the original on 2003-05-28. Retrieved 2014-09-23.
  15. ↑ A Chronology of Canadian Postal History, Rural Free Delivery, civilization.ca
  16. ↑ "Blue Mound, Missouri Postal History". Bluemoundhistory.com. Retrieved 2012-09-19.
  17. ↑ Rural Mailboxes, National Postal Museum
  18. 1 2 3 4 Bernstein, Fred, Public Eye; The Mailbox As Fortress, The New York Times, 25 February 1999, retrieved 24 January 2012
  19. ↑ Multifamily, NBNnews, 24 July 2006
  20. ↑ Strandberg, Erik, Intelligent Remote-Control Letter Box
  21. ↑ Shelley, Tom, “Safety first at the front door”, Eureka Magazine, Findlay Media Limited, 08 August 2007
  22. ↑ Frameless mail slot - Patent D480200; Airtight mail slot - Patent 2437319; Mail slot immobilizer - Patent D443125; Mail slot pouch assembly - Patent 4069965; Mail slot alarm - Patent 5382945; etc.
  23. ↑ Judis, John B., Mission Impossible, New York Times, September 25, 1988
  24. ↑ You've Got Mail . . . a Block Away, Philip Rucker, Washington Post, 17 June 2007
  25. ↑ Pappas, Max. "Cluster Boxes, Not Door-to-Door Delivery". Providence, Rhode Island Journal.
  26. ↑ USPS Handbook PO-630, Post Offices Serving DOD Installations, p.47
  27. ↑ Canada Post and Rural Canada: Stronger Together (FAQ), retrieved 26 January 2011
  28. 1 2 Rucker, Philip, You've Got Mail, A Block Away, 17 June 2007, retrieved 23 January 2012
  29. ↑ "Cluster Boxes Replacing Door-to-Door Delivery". Nations Building News.
  30. ↑ "Rural Community Mailboxes Unsafe, Say Residents". CBC News. December 7, 2007.
  31. 1 2 Williamson, Sarah L., Police name suspect in mailbox break-ins, thefts, Hickory Daily Record, retrieved 23 January 2012
  32. 1 2 3 Entire Mailbox Cluster Stolen, Channel 13 Action News, Las Vegas, 13 May 2009, retrieved 23 January 2012
  33. ↑ "Costly Mailbox Rules Take Effect in September". Nations Building News.
  34. 1 2 Lisaius, Som, Mail thieves hit Sierra Vista mobile home park, KOLD News, 10 January 2012, retrieved 23 January 2012
  35. ↑ Roseville Patch Staff, Crime Watch: Gas Siphoning, Vandalized Cars, Mailboxes, The Roseville Patch, retrieved 23 January 2012
  36. 1 2 Mailbox Break-in and Theft of Mail, City of Vancouver, Washington, retrieved 23 January 2012
  37. ↑ Auslander, Jason, Police Charge Man in String of Mailbox Break-ins, The Santa Fe New Mexican, 30 July 2009
  38. 1 2 Hamer, Roger, and Smollen, Gary, Cluster Crime In Council Bluffs, Channel 6 News, 6 October 2011, retrieved 23 January 2012
  39. 1 2 Rosenberg, Katherine, Thieves steal mail from 130 Phelan households and 18 cluster mailboxes, Victorville Daily Press, 4 January 2006
  40. ↑ Postal Employee Network, CBU Theft Photo, Phelan, CA, 4 January 2006, retrieved 23 January 2012
  41. ↑ Cluster Mailbox Burglary Prompts Investigation, The Orlando Sentinel, 29 May 2004
  42. ↑ City of Ventura, California, Home & Neighborhood Safety: Cluster Mailboxes, retrieved 23 January 2012: "Cluster mailboxes are those that house mail receptacles for several residences...They make particularly attractive targets for thieves, as once the back of the box is breached, all of the individual sections become accessible and mail from many households can be taken in a very short period of time."
  43. ↑ Arata Jr., Michael J., Identity Theft For Dummies, Hoboken, NJ: Wiley Publishing Inc., ISBN 978-0-470-56521-6 (2010), pp. 10-11
  44. ↑ Davis, Lois M., et al., The Role of the United States Postal Service in Public Safety and Security: Implications of Proposed Relaxation of the Mailbox Monopoly, Washington, D.C.: United States Postal Service/RAND Corporation, ISBN 978-0-8330-4615-4 (2008)
  45. ↑ http://www.oz-ebox.com.au/How-it-Works

See also

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