United States. Bureau of Mines & Walker, J. S. (1992). State-of-the-art techniques for backfilling abandoned mine voids. U.S. Dept. of the Interior, Bureau of Mines.
Chicago Style (17th ed.) CitationUnited States. Bureau of Mines and Jeffrey S. Walker. State-of-the-art Techniques for Backfilling Abandoned Mine Voids. Avondale, Md.: U.S. Dept. of the Interior, Bureau of Mines, 1992.
MLA (9th ed.) CitationUnited States. Bureau of Mines and Jeffrey S. Walker. State-of-the-art Techniques for Backfilling Abandoned Mine Voids. U.S. Dept. of the Interior, Bureau of Mines, 1992.
Warning: These citations may not always be 100% accurate.