Methods and costs of mining lignite in North Dakota,
Van Sant, Joel N.
Methods and costs of mining lignite in North Dakota, by J. N. Van Sant and R. C. Ellman. - [Washington], U.S. Dept. of the Interior, Bureau of Mines, 1959. - iv, 82 p. illus., maps, tables. 27 cm. - United States. Bureau of Mines. Information circular 7891 . - Information circular (United States. Bureau of Mines) ; 7891. .
int59000040
Lignite--North Dakota.
Strip mining.
TN295 / .U4 no. 7891
Methods and costs of mining lignite in North Dakota, by J. N. Van Sant and R. C. Ellman. - [Washington], U.S. Dept. of the Interior, Bureau of Mines, 1959. - iv, 82 p. illus., maps, tables. 27 cm. - United States. Bureau of Mines. Information circular 7891 . - Information circular (United States. Bureau of Mines) ; 7891. .
int59000040
Lignite--North Dakota.
Strip mining.
TN295 / .U4 no. 7891