A History of Photography: Contains an extensive history, from earliest times to the 1920s. Includes biographical information on all significant photographers.
George Eastman House Collections: Collection includes thousands of photographs and negatives dating from the invention of photography to the present day including many milestones and covering most photographic processes.
History of Photography Timeline: Highlights major developments in timeline format.
The Keystone-Mast Collection: Archive at the California Museum of Photography offers an encyclopedic view of world history and cultural diversity.