Testing of a diesel-powered impact cutting head for hard-rock mining /
by P.D. Kovscek, C.D. Taylor, and H. Handewith.
- Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1991.
- 16 p. : ill. ; 28 cm.
- Report of investigations ; 9374 .
- Report of investigations (United States. Bureau of Mines) ; 9374 .