Keywords: stereoscopic stereophotography stereophotographs historical usgs history geology mapping black and white blackandwhite bnw stereograph blackandwhite monochrome surreal depth of field snow black and white Yellowstone National Park, Wyoming. Great Fountain Geyser in Lower Geyser Basin.U.S. Geological and Geographical Survey of the Territories (Hayden Survey). Yellowstone National Park, Wyoming. Great Fountain Geyser in Lower Geyser Basin.U.S. Geological and Geographical Survey of the Territories (Hayden Survey). |