Presidential Pictures, Portraits, and Photographs

Portraits and Photographs of Presidents and First Ladies from the Library of Congress
America's Presidents exhibit from the National Portrait Gallery
National Portrait Gallery online collection
Presidential Image Gallery from the Miller Center
First Photographs of U.S. Presidents
Presidential Photos
Stock Photographs of the Presidents at Fotosearch
Memorable Presidential Photographs
Public & Private: Twenty Years Photographing the Presidency
American Heritage Illustrated History of the Presidents