Methods and Costs of Mining Lignite in North Dakota

Author:	Van Sant, Joel N.
Year:	1959
Document Type:	N/A
SUDOC:	I 28.27:7891
Series:	Information circular (United States. Bureau of Mines)
Report Number:	I. C. 7891
Subjects:	Lignite -- North Dakota.
	Strip mining.
Link:	http://digital.library.unt.edu/ark:/67531/metadc67088/