TY  - RPRT
TI  - Map showing approximate eastern limit of commercial oil and gas fields in relation to structural features and physiographic provinces in the Appalachian region
AU  - K.C. Bayer
PY  - 1982
DO  - 10.3133/oc121
UR  - https://pubs.usgs.gov/publication/oc121
ID  - oc121
ER  -