River in foreground, Trees behind, "Firehole River,…

Ansel Adams • 1941

River in foreground, Trees behind, "Firehole River, Yellowstone…, 1941

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River in foreground, Trees behind, "Firehole River, Yellowstone National Park," Wyoming

Credit: National Archives, Records of the National Park Service (Record Group 79), 79-AAT-14. Public domain (U.S. federal record). National Archives: access unrestricted, use unrestricted.