Longwall retreat of gate road pillars

By Jeffrey M. Listak

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Publish Date

1993

Publisher

U.S. Dept. of the Interior, Bureau of Mines

Language

eng

Pages

1-1 of 1 Editions

Longwall retreat of gate road pillars

Language: eng

Pages: 11

Published In: 1993

Publisher: U.S. Dept. of the Interior, Bureau of Mines