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| American Memory Project | Library of Congress. Written and spoken words, sound recordings, still and moving images, prints, maps, and sheet music that document the American experience. Millions of items arranged in browsable subject categories. |
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| Library of Congress. 1,118 Civil War photographs can be searched by keyword, browsed by subject, or viewed by year. There is a list of represented photographers (most of the photographs were made under the direction of Matthew Brady), a brief article on how photographs of the era were made, bibliographies, related links. |
| Colorado Digitization Project | Colorado images under "Heritage Colorado", arranged by subject; western regional images under "Western Trails", arranged by subject. |
| Footnote | >7 million images and documents. Some content free, much only available to subscribers. Includes images from NARA as well as individuals. Members may comment. |
| Historical Maps Online | Maps related to the history of Illinois and the Northwest Territory, 1650-1976. |
| Montana Memory Project | Images and documents related to Montana history. |
| New York Public Library Digital Collections | Illuminated manuscripts, maps, photographs, prints, etc. Arranged in searchable collections. |
| Online Archives of California | More than 120,000 images, 50,000 pages of documents, letters, and oral histories |
| Social Issues Collection | University of Washington. Japanese and Chinese Americans,War II Japanese internment camps of Camp Harmony (Puyallup) and Minidoka (Idaho); labor and politics, prohibition, legislative assemblies, women; socialist colonies in Washington State, camping, hiking and mountaineering, etc. |