Biblioteca SEGEMAR

Vista normal Vista MARC Vista ISBD

Barczak, Thomas M.

Critical-load studies of a shield support / by Thomas M. Barczak and David E. Schwemmer. - Pittsburgh, Pa. : U.S. Dept. of the Interior, Bureau of Mines, 1987. - 15 p. : ill. ; 28 cm. - Report of investigations ; 9141 . - Report of investigations (United States. Bureau of Mines) ; 9141. .

LCCN: 87600280

Subjects--Topical Terms:
Longwall mining.
Mine roof control.

LC Class. No.: TN23 TN275 / .U43 no. 9141

Dewey Class. No.: 622 s 622/.334

Gov. Doc. Class. No.: I 28.23:9141