Chekan, G. J.
Design practices for multiple-seam longwall mines / by Gregory J. Chekan and Jeffrey M. Listak. - Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1993. - ii, 35 p. : ill. ; 28 cm. - Information circular ; 9360 . - Information circular (United States. Bureau of Mines) ; 9360. .
Includes bibliographical references (p. 34-35).
93011140
Ground control (Mining)
Longwall mining.
TN295 TN288 / .U4 no. 9360
622 s 622/.334
Design practices for multiple-seam longwall mines / by Gregory J. Chekan and Jeffrey M. Listak. - Washington, D.C. : U.S. Dept. of the Interior, Bureau of Mines, 1993. - ii, 35 p. : ill. ; 28 cm. - Information circular ; 9360 . - Information circular (United States. Bureau of Mines) ; 9360. .
Includes bibliographical references (p. 34-35).
93011140
Ground control (Mining)
Longwall mining.
TN295 TN288 / .U4 no. 9360
622 s 622/.334