Middle and Upper Ordovician nautiloid cephalopods of the Cincinnati arch region of Kentucky, Indiana, and Ohio - Frey, Robert C.; United States. Dept. of Interior; United States. Government Printing Office (Washington, D.C. : U.S. G.P.O., 1995)
Keywords: Nautiloidea, Fossil -- Indiana; Nautiloidea, Fossil -- Ohio; Paleontology -- Ordovician; Animals, Fossil -- Kentucky; Animals, Fossil -- Indiana; Animals, Fossil -- Ohio