Pillar design methods for longwall mining
By: by Christopher Mark.
Series: Information circular (United States. Bureau of Mines) -- 9247.
Publisher: Dept. of the Interior
Published: 1990
Place of publication: Washington, DC
Language: eng
Number of pages: 53
Subjects: Longwall mining.; Pillaring (Mining)
Notes:  89600380  t_oclc

Bibliogr.

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