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Features of machine designed by author; first unit built for La Cholla Mining Co Ltd in Yuma County, Ariz, and test runs made in June 1932.
Features of machine designed by author; first unit built for La Cholla Mining Co Ltd in Yuma County, Ariz, and test runs made in June 1932.
Saving gold in cemented gravels
Min J (Phoenix Ariz)
Berger, H.W. (author)
1932
Article (Journal)
English
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