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Comparisons between cross-measure boreholes and surface gob holes

Goodman, Tobias W.
[Pittsburg, Pa.?] : U.S. Dept. of the Interior, Bureau of Mines, [1986] 1986

Prediction of longwall methane emissions an evaluation of the influence of mining practices on gas e

Diamond, W. P. (William P.)
Pittsburgh, Pa. : U.S. Dept. of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Pittsburgh Research Laboratory [1999] 1999