Performance of a novel bump control pillar extracting technique during room-and-pillar retreat coal mining

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by
Dept. of the Interior , Washington, DC
Pillaring (Mining), Coal mines and mining -- West Virginia -- McDowell C
Statementby Alan A. Campoli, David C. Oyler, and Frank E. Chase.
SeriesReport of investigations (United States. Bureau of Mines) -- 9240.
ContributionsOyler, David C., Chase, Frank E.
Classifications
LC ClassificationsUSBMRI#9240 1989
The Physical Object
Paginationii, 40 p. :
ID Numbers
Open LibraryOL22072730M
LC Control Number88-600453