TY  - RPRT
TI  - Preliminary report on the Pierre Shale in North Park, Colorado, and its correlation to Boulder, Middle Park, and Northwest Colorado
AU  - Dawn H. Madden
PY  - 1979
DO  - 10.3133/ofr79729
UR  - https://pubs.usgs.gov/publication/ofr79729
ID  - ofr79729
ER  -