TY  - RPRT
TI  - Distribution of the basal clastic unit of the Oligocene Chadron Formation in the alliance 2-degree Quadrangle, northwestern Nebraska
AU  - K. A. Dickinson
PY  - 1990
DO  - 10.3133/ofr90416
UR  - https://pubs.usgs.gov/publication/ofr90416
ID  - ofr90416
ER  -