David Octavius Hill and Robert Adamson, David Octavius Hill, Robert Adamson The Gowan: Margaret and Mary McCandlish, ca. 1845; photograph; salt print from a calotype negative on paper, 10 1/2 in. x 14 5/8 in. (26.7 cm x 37.2 cm); Collection SFMOMA, Agnes E. Meyer and Elise Stern Haas Fund
