Coal mine illumination :proceedings, Bureau of Mines Technology Transfer Seminars.

Year:	1976
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:8709
Series:	Information circular - Bureau of Mines ;
Report Number:	8709
Subjects:	Coal mines and mining--United States--Congresses
	Mine lighting--Congresses
Link:	https://hdl.handle.net/2027/mdp.39015078462465