Keywords: stereoscopic stereophotography stereophotographs historical usgs history geology mapping black and white blackandwhite bnw stereograph blackandwhite monochrome outdoor black and white Yellowstone National Park, Wyoming. Lower Yellowstone Falls.U.S. Geological and Geographical Survey of the Territories (Hayden Survey). Stereoscopic view. Yellowstone National Park, Wyoming. Lower Yellowstone Falls.U.S. Geological and Geographical Survey of the Territories (Hayden Survey). Stereoscopic view. |