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Roof support in coal mines in the Irwin, Greensburg and Latrobe Basins, Westmoreland County, Pa.
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Published Year
1930-1939 (1)
Subject
Coal mines and mining--Pennsylvania--Westmoreland County (1)
Mine timbering (1) *
Author
Craighead, S. J. (1) *
Paul, J. W. (1)
Tomlinson, H. (1)
