Improved drilling of coal measure rocks for underground mine void detection and exploration programs
By: by Pamela J. Watson, Patrick A. Tuzinski, and John E. Pahlman.
Contributors: Tuzinski, Patrick A.; Pahlman, J. E.
Series: Report of investigations ;; 9370; Report of investigations (United States. Bureau of Mines) ;; 9370
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1991
Place of publication: Washington, D.C
Language: eng
Number of pages: 28
Subjects: Mine surveying.; Abandoned coal mines.; Coal-cutting bits.; Polyethylene oxide.
Notes: Includes bibliographical references (p. 11).