Image:OP-4726.jpg

It is believed that the use of these materials

• for educational purposes, in articles relating to the subject of the photograph,
• on the English-language Wikipedia, hosted on servers in the United States by the non-profit Wikimedia Foundation,
• where the resolution used is insufficient for print use and thus does not materially harm the licensing of these images for publication, and
• where no free alternative is available,

qualifies as fair use. Any other use of this image, on Wikipedia or elsewhere, may be copyright infringement. See Wikipedia:Non-free content for more information.

Additionally, permission may have been received to place this image on Wikipedia, but the terms of the permission would not include third party use. If this is the case, the permission will be noted below.

Use that does not fall under fair use may require the permission of the Denver Public Library.

• it "identifies the subject of the article(s), and specifically illustrates relevant points or sections within the text;"
• the image places the subject of the article(s) and/or related items in a historical context as it depicts certain pieces of equipment, structures, people, operations, or events, at a particular location, on a specified date and/or time (equipment and/or structures bear specific paint and/or other identifying decorations);
• the image has been carefully selected to show various aspects of the subject matter not shown in any other image;
• the image has a detailed caption that demonstrates its relevance to the article(s); and
• due the historical context, no free equivalent is available or could be created that would adequately give the same information (the subject of the photograph likely no longer exists in the subject context, and therefore a freely-licensed photograph cannot be taken).