United States. Bureau of Mines & Colorado. Department of Natural Resources. Minerals in the economy of Colorado. Dept. of the Interior, Bureau of Mines.
Chicago Style (17th ed.) CitationUnited States. Bureau of Mines and Colorado. Department of Natural Resources. Minerals in the Economy of Colorado. [Washington]: Dept. of the Interior, Bureau of Mines.
MLA (9th ed.) CitationUnited States. Bureau of Mines and Colorado. Department of Natural Resources. Minerals in the Economy of Colorado. Dept. of the Interior, Bureau of Mines.
Warning: These citations may not always be 100% accurate.