TY  - RPRT
TI  - Preliminary stratigraphic cross section showing radioactive black shale zones in the Devonian black shales in eastern Ohio and west-central Pennsylvania
AU  - John B. Roen
AU  - L.G. Wallace
AU  - Wallace De Witt
PY  - 1977
DO  - 10.3133/ofr77840
UR  - https://pubs.usgs.gov/publication/ofr77840
ID  - ofr77840
ER  -