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Tarr has compiled the information, up to 1893, concerning the mineral resources and industries of the United States. Although intended as a text-book to supplement a course of lectures at Cornell University, the style of the writer makes-it of general interest. Part I treats of the common rock and vein-forming minerals and ores, the rocks of the earth's crust, physical geography and geology of the United States, origin of ore deposits, and mining terms and methods. Part II takes updoi:10.1086/276048 fatcat:ebxtne3d6fcbfizrnxl4lolqei