Biblioteca SEGEMAR

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Watson, Pamela J.

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. - Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1991. - 28 p. : ill. ; 28 cm. - Report of investigations ; 9370 . - Report of investigations (United States. Bureau of Mines) ; 9370 .

Includes bibliographical references (p. 11).

LCCN: 91008575

Subjects--Topical Terms:
Mine surveying.
Abandoned coal mines.
Coal-cutting bits.
Polyethylene oxide.

LC Class. No.: TN23 TN273 / .U43 no. 9370

Dewey Class. No.: 622 s 622

Gov. Doc. Class. No.: I 28.22:9370