Twenty-First Annual report of the Director of the United States Geological Survey, 1899-1900: Part VI(continued)- Mineral Resources of the United States, 1899 Nonmetallic Products, Except Coal and Coke
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Sixteenth Annual Report U. S. Geological Survey, Parts III and IVSixteenth Annual Report of the United States Geological Survey. Part III, Mineral Resources of the United States, 1894, Metallic Products.Sixteenth Annual Report of the United States Geological Survey. Part IV Nonmetallic Products.
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