TY  - RPRT
TI  - Preliminary digital model of ground-water flow in the Madison Group, Powder River Basin and adjacent areas, Wyoming, Montana, South Dakota, North Dakota, and Nebraska
AU  - Leonard F. Konikow
PY  - 1976
DO  - 10.3133/wri7563
UR  - https://pubs.usgs.gov/publication/wri7563
ID  - wri7563
ER  -