Portal:Contents/Lists of topics/Reference

From Wikipedia, the free encyclopedia

General reference lists • Abbreviations • Collective nouns • Common misspellings • Etymologies • Library and information science • Ologies • Pairs • Postal codes • Topics by country • Unusual articles

Reference organizations 

Libraries • Types of libraries • Digital library projects • National libraries

Reference works • Almanacs • Dictionaries • Encyclopedias • Free online journals • How-tos (Wikibook how-tos) • Newsgroups • Newspapers • Web directories

Research tools and resources • Free software programs • IRC clients • News clients • Periodic table • Search engines

Standards • Numbering schemes

International Standards • List of ISO standards • ISO 639 language names • ISO 3166 country codes • Time zones • Country calling codes • Internet TLDs • plastic recycling codes

United States Standards • Federal Standard 1037C (Glossary of telecommunication terms) • FIPS country codes • U.S. postal abbreviations

Size, measurement and conversions

SI • SI base units • SI derived units • SI prefix

Unit conversions

Orders of magnitude • Length • Area • Volume • Mass • Time

Specific measures • Cooking • Ancient • Medieval • Paper sizes