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Keywords: stereoscopic stereophotography stereophotographs historical usgs history geology mapping black and white blackandwhite bnw stereograph blackandwhite monochrome outdoor landscape mountain mountainside hill black and white Stereo studies about Mt. Blackmore, M.T. Upper canyon of Middle Creek. Gallatin County, Montana. 1872. Stereo studies about Mt. Blackmore, M.T. Upper canyon of Middle Creek. Gallatin County, Montana. 1872. |