Kovscek, P. D.

Evaluation of water-jet-assisted drilling with handheld drills / by P.D. Kovscek, C.D. Taylor, E.D. Thimons - Pgh. [i.e. Pittsburgh] Pa. : U.S. Dept. of the Interior, Bureau of Mines, 1988 - 20 p. : ill. ; 28 cm. - U.S. Bureau of Mines. Report of investigations 9174 .

Bibliography: p. 15.


Boring.
Water jets.

USBM ri-9174