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U.S. Bureau of Mines Program in Mining Difficult Coal Seams.
2nd Int'l Symp on Mining Difficult Coal Seams Luxembourg 1984 :12 pages
2nd Int'l Symp. on Mining Difficult Coal Seams, Luxembourg, 1984, 12 Pp
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division