» A History of Photography    Contains an extensive history, from earliest times to the 1920s. Includes biographical information on all significant photographers.    http://www.rleggat.com/photohistory/

» 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.    http://www.eastmanhouse.org/inc/collections/photography.php

» History of Photography Timeline    Highlights major developments in timeline format.    http://photo.net/learn/history/timeline

» The Keystone-Mast Collection    Archive at the California Museum of Photography offers an encyclopedic view of world history and cultural diversity.    http://www.cmp.ucr.edu/mainFrame/collections/guides/kmast/