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Keywords: stereoscopic stereophotography stereophotographs historical usgs history geology mapping black and white blackandwhite bnw stereograph blackandwhite monochrome outdoor black and white High trestle work; between Tunnel No. 2 and Wasatch. Summit County, Utah. 1869. High trestle work; between Tunnel No. 2 and Wasatch. Summit County, Utah. 1869. |