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History
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Contains an extensive history, from earliest times to the 1920s. Includes biographical information on all significant photographers.
http://www.rleggat.com/photohistory/
Highlights major developments in timeline format.
site exerpt
History of Photography Timeline Accidental creation of the first photo-sensitive compound. 1800: Thomas Wedgwood makes sun pictures by placing opaque objects on leather treated with silver nitrate; resulting images deteriorated rapidly, however, if displayed under light stronger than from candles. 1816: Nicphore Nipce combines...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