Improved drilling of coal measure rocks for underground mine void detection and exploration programs /
by Pamela J. Watson, Patrick A. Tuzinski, and John E. Pahlman.

APA Citation

Watson, P. J., Pahlman, J. E. (John E.)., Tuzinski, P. A., United States. Bureau of Mines. (1991). Improved drilling of coal measure rocks for underground mine void detection and exploration programs. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines.

MLA Citation

Watson, Pamela J, J. E. (John E.) Pahlman, Patrick A Tuzinski, and United States. Bureau of Mines. Improved Drilling of Coal Measure Rocks for Underground Mine Void Detection And Exploration Programs. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines, 1991.