TY  - RPRT
TI  - Ordovician conodonts and stratigraphy of the ST. Peter sandstone and glen wood shale, central United States
AU  - B.J. Witzke
AU  - R.A. Metzger
PY  - 2005
UR  - https://pubs.usgs.gov/publication/70027904
ID  - 70027904
ER  -