Riverside Geyser, 200 ft., Yellowstone Park [Postcard]
Riverside Geyser, Upper Geyser Basin, Yellowstone National Park [Postcard]
Roaring Mountain, Yellowstone Park [Postcard]
Rocky Mt. Bee Plant, Cleome Glabra, Yellowstone Park [Postcard]
Sapphire Pool and Biscuit Basin, Yellowstone Park [Postcard]
Shaw and Powell Two-Room Tent Interior, Yellowstone Park [Postcard]
Shoshone Canyon and Tunnel, Yellowstone Park [Postcard]
Shoshone Dam, 328 ft., Yellowstone Park [Postcard]
Silver Gate, Bunsen Peak, Yellowstone Park [Postcard]
Speedboat Adelaide, Yellowstone Lake, Yellowstone Park [Postcard]
Spiral Bridge, S Hill, Cody Road, Yellowstone Park [Postcard]
Sponge Geyser, 4 ft., Yellowstone Park [Postcard]
Stone Arch, Entrance to Yellowstone National Park [Postcard]
Summit Basin, Yellowstone National Park [Postcard]
Switchbacks Climbing Beartooth Mountains on Red Lodge-Cooke City Road to Yellowstone National Park [Postcard]
Sylvan Lake, Cody Road, Yellowstone Park [Postcard]
Sylvan Pass Loop, Cody Road to Yellowstone National Park [Postcard]
The Campfire Entertainment, Yellowstone Park [Postcard]
The Celebrated Old Faithful Geyser, Yellowstone National Park [Postcard]
The Lookout, Summit of Mt. Washburn, 10,317 ft., Yellowstone Park [Postcard]
The Terraces, Brightly Colored Formations Of Calcium carbonate, and Mt. Everts at Mammoth, Yello [Postcard]wstone Park
The Tioga Road and the High Sierra Between Lake Tahoe and Yosemite National Park [Postcard]
The Upper Falls of the Yellowstone River, Yellowstone National Park [Postcard]
