Horizontal Section of the Comstock Lode at the Sutro Tunnel Level (1900 ft.) and below. Horizontal Section of the Lode. North End. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet VIII. Mapping by R.H. Stretch. Geology by G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
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Horizontal Section of the Comstock Lode at the Sutro Tunnel Level (1900 ft.) and below. Horizontal Section of the Lode. North End. United States Geological Survey. Geology of the Comstock Lode, &c. Atlas Sheet VIII. Mapping by R.H. Stretch. Geology by G.F. Becker, Geologist in Charge. Julius Bien & Co. Lith. N.Y.
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