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Scientific American, Vol. 68, No. 1 (1893) (1893)
leaf 8
nse practically inexhaustible. We may, therefore, pro- all that we havesaidabove. Dr. Newberry is professor nounce the company’s quarries an almost ideal source scale on which the operations are there carried on. of geology in Columbia College School of Mines; the From the everyday point of view a… … © 1893 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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