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  • McCarthy Album 09, Photograph 025
    McCarthy Album 09, Photograph 025

    Caption: "Emerald Pool Yellowstone," c. 1923. Grace McCarthy (fourth from the right) and several unidentified people admire Emerald Pool in Yellowstone National Park. The pool, sometimes called Emerald Spring, is located in the park's Black Sand Basin. Yellow sulphur deposits, combined with the blue of the water, give the pool a vivid green color.

    Date: 1923