Inspection standards for bituminous-coal and lignite mines :revised July 1945.

Year:	1945
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7333
Series:	Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number:	7333
Subjects:	Coal mines and mining--United States
	Lignite industry--United States
	Mine inspection--Standards--United States
Link:	https://hdl.handle.net/2027/mdp.39015074127914