TY  - RPRT
TI  - Composition, clay mineralogy, and diagenesis of the Simpson Group (Middle Ordovician), Grady County, Oklahoma
AU  - Richard M. Pollastro
PY  - 1991
DO  - 10.3133/b1866h
UR  - https://pubs.usgs.gov/publication/b1866H
ID  - b1866H
ER  -