Sky Chief (Tirawahut Resaru), ca. 1867, Albumen silver print from glass negative, Image: 18.6 ? 13.2 cm (7 5/16 ? 5 3/16 in.), Photographs, Attributed to Edric L. Eaton (American, 1836?1890), This portrait of Sky Chief (Tirawahut Resaru), a Pawnee, h