TY  - BOOK
AU  - Van Sant,Joel N.
AU  - Ellman,R.C.
TI  - Methods and costs of mining lignite in North Dakota,
T2  - United States. Bureau of Mines. Information circular
AV  - TN295 .U4 no. 7891
PY  - 1959///
CY  - [Washington]
PB  - U.S. Dept. of the Interior, Bureau of Mines
KW  - Lignite
KW  - North Dakota
KW  - Strip mining
ER  -