TY  - RPRT
TI  - A summary of the U.S. Geological Survey 1999 resource assessment of selected coal zones in the Northern Rocky Mountains and Great Plains region, Wyoming, Montana, and North Dakota
AU  - M.S. Ellis
AU  - D. J. Nichols
PY  - 2002
DO  - 10.3133/b2189
UR  - https://pubs.usgs.gov/publication/b2189
ID  - b2189
ER  -