Some suggestions on safety in timbering anthracite mines

Author:	Currie, Robert Dewey,
Year:	1939
Document Type:	MAIN
Issuing Agency:	U.S. Govt. Print. Off.,
Series:	Miners' circular ;
Report Number:	38
Subjects:	Coal mines and mining--Safety measures
	Mine timbering
Link:	https://hdl.handle.net/2027/mdp.39015077562265