• Castle Geyser, Yellowstone Park.

    Detroit Publishing Co

    Colorized postcard of Castle Geyser in Yellowstone National Park. Castle Geyser has the largest cone and may be the oldest of all geysers in the Upper Geyser Basin. The Detroit Publishing Co. 1887-193…

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  • Mortar Geyser, Yellowstone Park.

    Detroit Publishing Co

    Colorized postcard of Mortar Geyser in Yellowstone National Park. Eruptions from the Mortar Geyser can reach between 60 and 80 feet. The Detroit Publishing Co. 1887-1936 They produced postcards on a g…

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  • Sapphire Pool, Upper Geyser Basin, Yellowstone Park.

    Detroit Publishing Co

    Colorized postcard of the Sapphire Pool in Yellowstone National Park. The Sapphire Pool was named for its deep blue color. The pool was a geyser for a few years after a earthquake in 1959 but it is on…

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