TY  - RPRT
TI  - Preliminary synthesis of subsurface stratigraphy of the Niobrara Formation (Upper Cretaceous) in the Northern Great Plains
AU  - George W. Shurr
AU  - Jayne L. Sieverding
PY  - 1980
DO  - 10.3133/ofr801266
UR  - https://pubs.usgs.gov/publication/ofr801266
ID  - ofr801266
ER  -