TY  - RPRT
TI  - Summary of the geology, mineral resources, landscape geochemistry, and engineering geologic characteristics of the northern Powder River coal region, Montana: Geology and mineral resources
AU  - W. J. Mapel
AU  - Vernon Emanuel Swanson
PY  - 1977
DO  - 10.3133/ofr77292a
UR  - https://pubs.usgs.gov/publication/ofr77292A
ID  - ofr77292A
ER  -