Methods and costs of mining lignite in North Dakota
By: by J. N. Van Sant and R. C. Ellman.
Contributors: Ellman, R. C., joint author.
Series: United States. Bureau of Mines. Information circular; 7891; Information circular (United States. Bureau of Mines) ;; 7891.
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1959
Place of publication: [Washington]
Language: eng
Number of pages: 82
Subjects: Lignite -- North Dakota.; Strip mining.