America's First Look into the Camera : Daguerreotype Portraits and Views / from Library of Congress American Memory Project http://lcweb2.loc.gov/ammem/daghtml/daghome.html
American Photography Museum http://www.photographymuseum.com/main.html
Contains biographical information, articles, images, and Web links to other Web sites for over 45 photographers.
J. Paul Getty Museum (http://www.getty.edu/art/): Browse by photography (type) or search "photographer" or search for a specific photographer
The Museum has an extensive Photography Collection. The Web site lists 148 photographers whose works the Museum owns. Under each photographer is a brief biographical account and examples of their photography.
Masters of Photography http://www.masters-of-photography.com/
"Collection is concentrated on the first 75 years of photography--from shortly after the medium's invention in 1839 until the first World War. Collection includes five thousand individual images, from the earliest daguerreotype portraits through the first practical color photographs. "
Mother of All Art History Links: Research Resources: Photographyhttp://www.umich.edu/~hartspc/histart/mother/resource.html#anchor427107