View shows W. P. A. students learning the art of placer mining by using a rocker on the banks of an unidentified stream, Denver, Colorado. A rocker consists of a screen box on top draining to a larger box below which is inlaid with riffles to catch...
United States. Works Progress Administration of Colorado.--1930-1940.; Denver (Colo.)--1930-1940.; Hydraulic mining--Colorado--Denver--1930-1940.; Mining equipment--Colorado--Denver--1930-1940.; Mining--Colorado--Denver--1930-1940.
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