Keywords: stereoscopic stereophotography stereophotographs historical usgs history geology mapping black and white blackandwhite bnw stereograph blackandwhite monochrome outdoor black and white Colorado River, Glen Canyon, Sentinel Rock. Mouth of Sentinel Creek, between the Crossing of the Fathersand the Paria, right bank. 1871. Photo by E.O. Beaman). (Stereoscopic view). Colorado River, Glen Canyon, Sentinel Rock. Mouth of Sentinel Creek, between the Crossing of the Fathersand the Paria, right bank. 1871. Photo by E.O. Beaman). (Stereoscopic view). |