About.com: 20th Century History
Photographs of the Great Depression.
Franklin Delano Roosevelt Library Photos
Library of Congress: “America from the Great Depression to World War II: Photographs from the FSA – OWI, 1935-1945”
These are the famous photographs that you know—Dorothea Lange, etc.
Library of Congress: “Voices from the Dust Bowl”
Audio and photographs from the Library of Congress.
New Deal Network Photo Gallery
Excellent photos of everything from bread lines to soup kitchens to bank runs. To use, we must ask permission, but it appears that they have a generous educational policy.
Picturing the Century: The Great Depression and the New Deal
Online photos from a small collection at the National Archives and Records Administration.