TY  - RPRT
TI  - Preliminary potentiometric-surface map showing fresh-water heads for the Lower Cretaceous rocks in the northern Great Plains of Montana, North Dakota, South Dakota, and Wyoming
AU  - David H. Lobmeyer
PY  - 1980
DO  - 10.3133/ofr80757
UR  - https://pubs.usgs.gov/publication/ofr80757
ID  - ofr80757
ER  -