TY  - RPRT
TI  - Correlation of Permian and Pennsylvanian rocks from western Kansas to the Front Range of Colorado
AU  - John Charles Maher
AU  - Jack B. Collins
PY  - 1952
DO  - 10.3133/oc46
UR  - https://pubs.usgs.gov/publication/oc46
ID  - oc46
ER  -