| William Henry Jackson Middle Creek, near Mount Blackmore, Montana 1872 Albumen silver print 8 13/16 × 12 1/2 ins (22.4 × 31.7 cm) (image) 10 1/4 × 12 15/16 ins (26 × 32.9 cm) (sheet) 15 7/8 × 19 1/2 ins (40.3 × 49.5 cm) (mount) Philadelphia Museum of Art Gift of Harvey S. Shipley Miller, 2014, Accession Number: 2014-199-107 LL/71238
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