Limper Geology Museum at Miami University
- Fossil collection of primarily southwestern Ohio, northern Kentucky, and eastern Indiana Upper Ordovician.
- http://www.cas.muohio.edu/limpermuseum/

Cincinnatian Fossils of the Ordovician Period
- Contains photographs and descriptions of fossils collected from the Cincinnatian Series.
- http://members.wri.com/jeffb/Fossils/

Cincinnatian Trilobites
- Information about trilobites from the Upper Ordovician Period Cincinnatian Seiries of Eastern North America. Includes images and links.
- http://www.isotelus.com/

The Paul Sanders Fund
- Fund supported by the Cincinnati Dry Dredgers offering small grants to researchers working on fossils of the Cincinnatian Series and other fossils in the area.
- http://drydredgers.org/sanders.html