Biblioteca SEGEMAR

Vista normal Vista MARC Vista ISBD

Allwes, Richard A.

The Effects of a retreating longwall on a three-entry gate road system / by Richard A. Allwes ... [et al.]. - Pittsburgh, Pa. (P.O. Box 18070, Pittsburgh 15236) : U.S. Dept. of the Interior, Bureau of Mines, 1985. - ii, 19 p. : ill. ; 28 cm. - Report of investigations / United States Department of the Interior, Bureau of Mines ; 8996 . - Report of investigations (United States. Bureau of Mines) ; 8996. .

Bibliography: p. 18-19.

LCCN: 85600224

Subjects--Topical Terms:
Longwall mining.
Pillaring (Mining)
Mine roof bolting.
Gate roads (Mining)

LC Class. No.: TN23 TN275 / .U43 no. 8996

Dewey Class. No.: 622 s 622/.28

Gov. Doc. Class. No.: I 28.23:8996