Steaming pool in foreground, high horizon, "Fountain Geyser…
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Steaming pool in foreground, high horizon, "Fountain Geyser Pool, Yellowstone National Park," Wyoming.
Credit: National Archives, Records of the National Park Service (Record Group 79), 79-AAT-17. Public domain (U.S. federal record). National Archives: access unrestricted, use unrestricted.
