Eighteenth annual report of the United States Geological Survey to the Secretary of the Interior, 1896-1897: Part III - Economic geology
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Twenty-First Annual report of the Director of the United States Geological Survey, 1899-1900: Part II - General Geology, Economic Geology, Alaska
1900 ◽
1897 ◽
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1897 ◽
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1901 ◽
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