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/

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://www.photo.net/history/timeline

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/