Timbering regulations in certain coal mines of Pennsylvania, West Virginia, and Ohio

Author:	Paul, J. W.
Additional Authors:	Calverley, Joseph Gladstone,, Sibray, Donald Loammi,
Year:	1930
Document Type:	USBM
Issuing Agency:	U.S.Bureau of Mines,
SUDOC:	C 22.5:485
Series:	Technical paper / United States. Bureau of Mines ;
Report Number:	485.
Subjects:	Coal mines and mining--Ohio
	Mine timbering
	Coal mines and mining--West Virginia
	Coal mines and mining--Pennsylvania
Link:	https://hdl.handle.net/2027/mdp.39015077559428