TY  - RPRT
TI  - Analyses of lignites and associated rocks from the Fort Union region, North Dakota and Montana
AU  - Susan J. Tewalt
AU  - Ricky T. Hildebrand
AU  - Robert B. Finkelman
PY  - 1989
DO  - 10.3133/ofr89285
UR  - https://pubs.usgs.gov/publication/ofr89285
ID  - ofr89285
ER  -