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Search Results 1931 to 1940 of 5017
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Caption: "An Abandoned Hydraulic Mine near Camptonville Calif.," c. 1920. Hillside ravaged by hydraulic mining, in which a pressurized jet of water washes sediment and gravel into a series of sluices, allowing the heavier gold and gold-carrying sediment to sink to the bottom for removal. California banned this environmentally destructive practice in 1884.
Date: 1920
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Notice from Francis Biddle to All State and Local Police Authorities regarding assistance from local police authorities to confiscate prohibited articles
Date: Received December 30, 1941
