TY  - RPRT
TI  - Stratigraphic framework of Cambrian and Ordovician rocks in the central Appalachian basin from Richland County, Ohio, to Rockingham County, Virginia
AU  - R. T. Ryder
PY  - 1991
DO  - 10.3133/i2264
UR  - https://pubs.usgs.gov/publication/i2264
ID  - i2264
ER  -