Keywords: stereoscopic stereophotography stereophotographs historical usgs history geology mapping black and white blackandwhite bnw stereograph blackandwhite monochrome black and white Yellowstone National Park, Wyoming. Mud puffs in Lower Geyser Basin. 1872. U.S. Geological and Geographical Survey of the Territories (Hayden Survey). Stereoscopic view. Yellowstone National Park, Wyoming. Mud puffs in Lower Geyser Basin. 1872. U.S. Geological and Geographical Survey of the Territories (Hayden Survey). Stereoscopic view. |