Keywords: stereoscopic stereophotography stereophotographs historical usgs history geology mapping black and white blackandwhite bnw stereograph blackandwhite monochrome outdoor black and white Stereo studies about Mt. Blackmore, M.T. View in the Upper Canyon of Middle Creek. Gallatin County, Montana. 1872. (Stereoscopic view similar to Jackson, W.H. 970) Stereo studies about Mt. Blackmore, M.T. View in the Upper Canyon of Middle Creek. Gallatin County, Montana. 1872. (Stereoscopic view similar to Jackson, W.H. 970) |