The United States National Archives and Records Administration has uploaded 3,000 images to The Commons, "the world’s public photography archives on Flickr." The images are grouped into four collections:
Mathew Brady Civil War Photographs
DOCUMERICA Project by the Environmental Protection Agency - scenes of everyday life in the 1970s
Development and Public Works - Montana Flatriver Irrigation Project
Historical Photographs and Documents - Elvis and Nixon, Ansel Adams, Earth seen from space, and much more.