Roof support in coal mines in the Irwin, Greensburg and Latrobe Basins, Westmoreland County, Pa.

Author:	Paul, J. W.
Additional Authors:	Craighead, S. J., Tomlinson, H.
Year:	1931
Document Type:	BMRA
Issuing Agency:	United States Bureau of Mines,
SUDOC:	C 22.12:3113
Series:	Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number:	3113
Subjects:	Mine timbering
	Coal mines and mining--Pennsylvania--Westmoreland County
Links:	https://hdl.handle.net/2027/mdp.39015077567140
	no.3101-3125 1931