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  • McCarthy Album 09, Photograph 028
    McCarthy Album 09, Photograph 028

    Caption: "Paint Pots - Yellowstone," c. 1923. View of bubbling pools of mud known as mudpots or "paint pots" at Yellowstone National Park.

    Date: 1923

  • McCarthy Album 04, Photograph 146
    McCarthy Album 04, Photograph 146

    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