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A guide to geologic features in coal mines in the northern Appalachian coal basin
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Published Year
1980-1989 (1)
Subject
Coal mines and mining--Appalachian Region--Safety measures (1)
Coal--Geology--Appalachian Region (1)
Ground control (Mining)--Appalachian Region (1) *
Author
Jansky, Jacqueline H. (1)
Jeran, P. W. (1) *