TY  - RPRT
TI  - Age of the Bedford Shale, Berea Sandstone, and Sunbury Shale in the Appalachian and Michigan basins, Pennsylvania, Ohio, and Michigan
AU  - Wallace De Witt
PY  - 1970
DO  - 10.3133/b1294g
UR  - https://pubs.usgs.gov/publication/b1294G
ID  - b1294G
ER  -