| William Henry Jackson The Upper Twin Lake, Arkansas Valley, Colorado [United States Geological Survey] 1873 (taken) 1980s (print) Gelatin silver print 11.3 × 21.5 cm (4 7/16 × 8 7/16 ins) (image) George Eastman Museum Purchase with funds from the Horace W. Goldsmith Foundation and donors to the PhotoFinish 5K, 2016.0014.0001a LL/75798 This location was rephotographed for Mark Klett's "Rephotographic Survey Project" series.
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