TY  - RPRT
TI  - Preliminary map showing freshwater heads for the Red River Formation, Bighorn Dolomite, and equivalent rocks of Ordovician age in the Northern Great Plains of Montana, North Dakota, South Dakota, and Wyoming
AU  - W. Roger Miller
AU  - S.A. Strausz
PY  - 1980
DO  - 10.3133/ofr80730
UR  - https://pubs.usgs.gov/publication/ofr80730
ID  - ofr80730
ER  -