For those interested in the early history of photography -daguerreotypes, ambrotypes, calotypes etc., I can recommend the following sites :

[B]The Daguerreian Society

http://www.daguerre.org/home.html


[B]The Library of Congress - Daguerreotype Portraits and Views

http://lcweb2.loc.gov/ammem/daghtml/daghome.html


[B] Lost and Found - Rediscovering early photographic processes

http://imsc.usc.edu/haptics/LostandFound/t...uerreotype.html

http://imsc.usc.edu/haptics/LostandFound/t..._ambrotype.html


[B] University of Glasgow - The Calotype Process

http://special.lib.gla.ac.uk/hillandadamson/calo.html