This file is a work of a
U.S. Army soldier or employee, taken or made as part of that person's official duties. As a
work of the
U.S. federal government, it is in the public domain in the United States.
A sign advertising the Hoover Dike, made by the Army Corps of Engineers in 1938. Source: [http://www.saj.usace.army.mil/cco/HHD/hhdike.htm Army Corps of Engineers]
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