The photo sharing site Flickr is hosting the U.S. Environmental Protection Agency’s Documerica Project from the 1970s. The project ran from 1971-1977, with freelance photographers hired to take images related to environmental problems. There are more than 15,000 photos archived on the site.
This photo is one in a series from the ground and air that documented pre-pipeline conditions from Prudhoe Bay south to Valdez. This shot is of pattered ground as the result of massive ice formations north of Galbraith Lake. Photo by Dennis Cowals.

