Library of Congress, "America from the Great Depression to World War II: Photographs from the FSA-OWI, 1935-1945,"

http://lcweb2.loc.gov/ammem/fsowhome.html

This extensive collection of photographs from the federal Farm Service Administration and the Office of War Information includes thousands of photographs of rural and small town America during the late 1930s and the defense and war mobilization effort from 1935-1945, including many images taken in Pennsylvania.

Referenced in:
Pennsylvania and the Great Depression