Yellowstone National Park, Ranger Naturalist Service (1938) vintage poster by C. Don Powell. Original public domain image… https://www.rawpixel.com/image/8628558/image-art-public-domain-blueFree Image from public domain licenseGeography: the Grand Canyon, Yellowstone Park. Coloured lithograph after T.H. Thomas. https://www.rawpixel.com/image/13967495/image-art-mountain-public-domainFree Image from public domain licenseThe Great Blue Spring of the Lower Geyser basin, Yellowstone National Park. Colour lithograph by L. Prang after T. Moran. https://www.rawpixel.com/image/13955114/image-cloud-person-artFree Image from public domain licenseTower Falls and and sulphur mountain, Yellowstone National Park. Colour lithograph by L. Prang after T. Moran, 1874. https://www.rawpixel.com/image/13968426/image-cloud-plant-personFree Image from public domain licenseLower Yellowstone mountain range, Wyoming. Colour lithograph by L. Prang after T. Moran, 1874. https://www.rawpixel.com/image/13966998/image-plant-tree-artFree Image from public domain licenseHot springs of Gardiner's River, Yellowstone National Park. Colour lithograph by L. Prang after T. Moran, 1875. https://www.rawpixel.com/image/13952666/image-person-art-fireFree Image from public domain licenseHeadwaters of the Gallatin County, Yellowstone National Park, Montana by William Henry Jackson https://www.rawpixel.com/image/14281973/image-water-public-domain-natureFree Image from public domain licenseLispenard Stewart party, #6 - 5th Ave., N.Y. with trophies by old cedar tree, Mammoth Hot Springs, Yellowstone National Park… https://www.rawpixel.com/image/14278137/image-face-trophies-peopleFree Image from public domain license