In 1971, the Environmental Protection Agency created the DOCUMERICA Project, a program designed to document and catalogue the effects of the EPA in its efforts towards environmental conservation. After six years, the program was shut down, but the end result was a massive archive of images gathered by over 100 freelance photographers from all across America. A large part of these photographs are now housed on the US National Archives' online catalogue (as well as its Flickr page). These are my favorites.
Walt Whitman Bridge Crosses the Delaware River at South Philadelphia, Leads to New Jersey Suburbs, 1973
Photographer: Dick Swanson
Dick Swanson Philadelphia Pennsylvania 1973 DOCUMERICA photography
Center City, Philadelphia, 1973
Photographer: Dick Swanson
Dick Swanson Philadelphia Pennsylvania 1973 DOCUMERICA photography
Crossing the Painted Road Which Extends East from the Philadelphia Museum of Art. Center City Background, 1973
Photographer: Dick Swanson
Dick Swanson Philadelphia Pennsylvania 1973 DOCUMERICA photography