Eighteenth annual report of the United States Geological Survey to the Secretary of the Interior, 1896-1897: Part V - Mineral resources of the United States, 1896, metallic products and coal
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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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