Field evaluation of three longwall pillar systems in a Kentucky coal mine
By: by Timothy M. Barton and Christopher Mark.
Contributors: Mark, Christopher.
Series: Report of investigations (United States. Bureau of Mines) -- no.9283.
Publisher: Dept. of the Interior
Published: 1989
Place of publication: Washington, DC
Language: eng
Number of pages: 13
Subjects: Columns -- Testing; Ground control (Mining); Longwall mining -- Kentucky -- Letcher County
Notes:  89600199  t_oclc

Bibliogr.

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