“Striving to define photography as an art-form by a simple and direct presentation through purely photographic methods” exclusive of ideals derived from other fine arts, the seven members of Group f.64 (Bloomsbury, $35) proclaimed the future of photography in 1932. Much in this manifesto seems a given now, but when Adams, Weston, Imogen Cunningham, and others united in the name of the camera’s small aperture setting, what photography could and should do was hotly debated. In her combination history and group biography, Mary Street Alinder chronicles the mainly West Coast “pure photography” movement, revisiting exhibits and arguments as the form came into its own. Her book is as much a chronicle of the 1930s themselves as it is of photography, as she documents the rigors of the Great Depression. Dedicated to making beautiful pictures, the artists also confronted the suffering around them and, inspired foremost by Dorothea Lange, widened the scope of photography’s mission to include social engagement. A photographer herself, Alinder illuminates the technical side of her subject with details about cameras, lenses, exposure times, and paper. She has worked directly with several of the original Group f.64 members, and her portraits convey the wonderfully vivid figures behind the images.