TY  - RPRT
TI  - Studies of the Pierre Shale in the Northern Great Plains
AU  - James R. Gill
AU  - William Aubrey Cobban
AU  - Leonard Gene Schultz
PY  - 1976
DO  - 10.3133/pp392
UR  - https://pubs.usgs.gov/publication/pp392
ID  - pp392
ER  -