| Timothy H. O'Sullivan Canyon de Chelle, Walls of the Grand Canyon About 1200 Feet in Height 1873 Albumen print 20.3 x 27.6 cm (8 x 10 7/8 in) American Art Museum, Smithsonian Institution Museum purchase from the Charles Isaacs Collection made possible in part by the Luisita L. and Franz H. Denghausen Endowment LL/7596
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