Geological Survey (U.S.) & Kelly, T. (2001). Historical statistics for mineral and material commodities in the United States (Version 6.7.). U.S. Department of the Interior, U.S. Geological Survey.
Chicago Style (17th ed.) CitationGeological Survey (U.S.) and Thomas Kelly. Historical Statistics for Mineral and Material Commodities in the United States. Version 6.7. [Reston, Va.]: U.S. Department of the Interior, U.S. Geological Survey, 2001.
MLA (9th ed.) CitationGeological Survey (U.S.) and Thomas Kelly. Historical Statistics for Mineral and Material Commodities in the United States. Version 6.7. U.S. Department of the Interior, U.S. Geological Survey, 2001.
Warning: These citations may not always be 100% accurate.