Keywords: stereoscopic stereophotography stereophotographs historical usgs history geology mapping black and white blackandwhite bnw stereograph blackandwhite monochrome outdoor water landscape waterfall skyline black and white Stereo studies about Mount Blackmore, M.T. Cascades, head of Middle Creek. Gallatin County, Montana. 1872. (Stereoscopic view similar to Jackson, W.H. 977) Stereo studies about Mount Blackmore, M.T. Cascades, head of Middle Creek. Gallatin County, Montana. 1872. (Stereoscopic view similar to Jackson, W.H. 977) |