United States. Bureau of Mines & Chekan, G. J. (1993). Design practices for multiple-seam longwall mines. U.S. Dept. of the Interior, Bureau of Mines.
Chicago Style (17th ed.) CitationUnited States. Bureau of Mines and G. J. Chekan. Design Practices for Multiple-seam Longwall Mines. Avondale, Md.: U.S. Dept. of the Interior, Bureau of Mines, 1993.
MLA (9th ed.) CitationUnited States. Bureau of Mines and G. J. Chekan. Design Practices for Multiple-seam Longwall Mines. U.S. Dept. of the Interior, Bureau of Mines, 1993.
Warning: These citations may not always be 100% accurate.