Technology of lignitic coals :in two parts ;

Year:	1954
Document Type:	USBI
Issuing Agency:	U.S. Dept. of the Interior, Bureau of Mines,
SUDOC:	I 28.27:7691
Series:	Information circular / Bureau of Mines ;
Report Number:	7691.
Subjects:	Coal mines and mining
	Lignite
	Lignite--North Dakota
Link:	https://hdl.handle.net/2027/mdp.39015077564592