Pacific Pix has images from a film documentary on Imogen Cunningham and Dorothea Lange. Here's what the site says about itself:
Through Imogen Cunningham's and Dorothea Lange's work, we explore a century of photography and history.
The San Francisco Museum of Modern Art has an exhibit of Tina Modotti's work through June 2, 1996. The SF Bay Guardian has an excellent article about Tina Modotti, featuring some of her work with a 3x4 Graflex.
The Library of Congress site Journalists, Photographers, and Broadcasters focuses on the efforts of eight women who photographed during wartime, from the front. Read a review of the exhibit from WNBA Signature Magazine.
Also, see the Library of Congress American Memory exhibit, including its selection of Prints and Photographs.
Don't miss the photo of Dorothea Lange with her 5x7 Graflex, photographing the US internment of Japanese-Americans during WWII.
If you like Lange's work, a recent paperback book available of interest is Photographing The Second Gold Rush: Dorothea Lange and the Bay Area at War, 1941-1945.
The Oakland Museum of California owns the world's premiere collection of the prints, negatives and personal papers of the late documentary photographer Dorothea Lange.
Berenice Abbot wrote the Graflex View Camera chapter in Graphic Graflex Photography.
The New York Public Library Center for the Humanities Miriam & Ira Wallach Division of Art, Prints and Photographs: Photography Collection has an excellent on-line exhibit of Abbott's work, in Changing New York 1935-1938
Margaret Bourke-White, the first women to be an accredited war photographer, was one of the first four photojournalists for Life magazine, and later for Fortune magazine. The movie Double Exposure chronicles her life.
Elsa Dorfman (a virtuoso photographer with the rare Polaroid 24"x36" camera) reviews Vicki Goldberg's book Margaret Bourke-White: A Biography .