Inspection standards for strip mines(coal and lignite).

Year:	1946
Document Type:	USBI
Issuing Agency:	Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7350
Series:	Information circular / Bureau of Mines ;
Report Number:	7350.
Subjects:	Coal mines and mining--Safety measures
	Mine inspection
Link:	https://hdl.handle.net/2027/mdp.39015077577354