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The Effects of a retreating longwall on a three-entry gate road system / by Richard A. Allwes ... [et al.]

By: Allwes, Richard A.
Material type: materialTypeLabelBookSeries: United States Bureau of Mines. Report of investigations 8996. Publisher: Washington : U.S. Dept. of the Interior, Bureau of Mines, (1985)Description: ii, 19 p. : ill. ; 28 cm.Report number: USBM ri-8996Subject(s): Longwall mining | Pillaring (Mining) | Mine roof bolting
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Bibliography: p. 18-19

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