ArtLex
Art Lex: Photography
Learn about the art, craft and processes of photography. Includes a list of famous photographers from time periods since 1839 when Louis Daguerre created the daguerreotype. Learn about the work and biography of each artist.
State Library-Florida
Florida Memory: Daguerreotype to Digital: Brief History of Photography
Online history of the photographic process arranged by type and time period.
Smithsonian Institution
Smithsonian American Art Museum: Isaac Rehn
As part of the Smithsonian Art Museum's database of artists, Isaac Rehn is described here along with information on his contributions to art through his experiments with the photographic process (called ambrotype).