Safety evaluations of longwall roof supports
By: by Thomas M. Barczak.
Series: Information circular (United States. Bureau of Mines)
Publisher: Dept. of the Interior
Published: 1989
Place of publication: Washington, DC
Language: eng
Number of pages: 17
Subjects: Mine roof control -- Evaluation; Longwall mining.
Notes:  89600003  t_oclc

Bibliogr.

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