U.S. Geological Survey Photographic Library

ID. Wheeler 1871, 10

Entrance to the Black Canyon of the Colorado River in Nevada. Photo by T.H. O'Sullivan.U.S. Geographical Surveys West of the One Hundredth Meridian (Wheeler Survey, 1871 Expedition).

Entrance to the Black Canyon of the Colorado River in Nevada. Photo by T.H. O'Sullivan.U.S. Geographical Surveys West of the One Hundredth Meridian (Wheeler Survey, 1871 Expedition).

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