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Many of the databases licensed by Penn including ARTstor, Oxford Art Online, and AP Images feature a wealth of photography. Below are some additional places to review.
Images from the Center for Creative Photography (Univ. of Arizona). This online collection contains images from the archives of Ansel Adams, Edward Weston, Garry Winogrand, Harry Callahan, and other twentieth-century photographers.
View a digital collection of photographs and prints owned by the Library of Congress, dating back to the Civil War. Also includes posters, comics, daguerreotypes, and blueprints.