1931 to 1933
Bottom of Black Canyon before Hoover Dam construction. Showing keys in wall, and adit tunnel entrance.
pho023203. Ray Cutright Collection of Winthrop A. Davis Photographs. PH-00123. Special Collections and Archives, University Libraries, University of Nevada, Las Vegas. Las Vegas, Nevada. http://n2t.net/ark:/62930/d16d5ph2q.
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