Paris, 1967 by Raymond DepardonCourtesy of Magnum PhotosWho? Founded in 1947, by Henri Cartier Bresson, Robert Capa, George Rodger and David Seymour, the Magnum group has made an indisputably vital contribution to the progression of photography. Not simply because they bestowed on the world a stunning documentation of the 20th century, but because of how the works were seen. The cooperative made the photographers the exclusive owners of their own works; images which...