Keywords: stereoscopic stereophotography stereophotographs historical usgs history geology mapping black and white blackandwhite bnw stereograph blackandwhite monochrome outdoor snow waterfall water landscape black and white Yellowstone National Park, Wyoming. Sawmill Geyser in Upper Geyser Basin. U.S. Geological and Geographical Survey of the Territories (Hayden Survey). Yellowstone National Park, Wyoming. Sawmill Geyser in Upper Geyser Basin. U.S. Geological and Geographical Survey of the Territories (Hayden Survey). |