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Keywords: stereoscopic stereophotography stereophotographs historical usgs history geology mapping black and white blackandwhite bnw stereograph blackandwhite monochrome outdoor black and white Stereo studies among the Rocky Mountains. Bridger Canyon near Fort Ellis. Gallatin County, Montana. 1872. Stereo studies among the Rocky Mountains. Bridger Canyon near Fort Ellis. Gallatin County, Montana. 1872. |