Lange's "Migrant Mother" is one of her most famous photographs. Dorothea Lange/Courtesy of the Library of Congress hide caption

itoggle caption Dorothea Lange/Courtesy of the Library of Congress

Boy with raisin bread, photograph for the cover of McCall's Homemaking Magazine, ca. 1944 Nickolas Muray/Courtesy of the National Museum of American History Photographic History Collection hide caption

itoggle caption Nickolas Muray/Courtesy of the National Museum of American History Photographic History Collection