Keywords: stereoscopic stereophotography stereophotographs historical usgs history geology mapping black and white blackandwhite bnw stereograph blackandwhite monochrome outdoor snow black and white Stereo studies among Mt. Blackmore, M.T. View in upper canyon of Middle Creek. Gallatin County, Montana. 1872. (Stereoscopic view similar to Jackson, W.H. 969) Stereo studies among Mt. Blackmore, M.T. View in upper canyon of Middle Creek. Gallatin County, Montana. 1872. (Stereoscopic view similar to Jackson, W.H. 969) |