TY  - RPRT
TI  - Preliminary report on the lignite resources of the Niobe area, Burke and Ward counties, North Dakota
AU  - Hal E. Owen
PY  - 1977
DO  - 10.3133/ofr77379
UR  - https://pubs.usgs.gov/publication/ofr77379
ID  - ofr77379
ER  -