Accidents from falls of rock or ore at metal and nonmetallic mines :metal-and nonmetallic-mine accident-prevention course.

Additional Authors:	Stott, Roy G., Thomas, Edward.
Year:	1957
Document Type:	MAIN
Issuing Agency:	U.S. Govt. Print. Off.,
Series:	Miners' circular ;
Report Number:	52
Subjects:	Mine safety--United States
	Mine accidents--United States
Link:	https://hdl.handle.net/2027/mdp.39015077562224