TY  - RPRT
TI  - Corals as guides to divisions of the Pennsylvanian system in the Western Interior region
AU  - W.J. Sando
PY  - 1984
DO  - 10.3133/ofr8479
UR  - https://pubs.usgs.gov/publication/ofr8479
ID  - ofr8479
ER  -