Middle and Upper Ordovician Symmmetrical Univaled Mollusks [ Monopiacophora and Bellerophontina ] of the Cincinnati Arch Region
Wahlman, G.
Middle and Upper Ordovician Symmmetrical Univaled Mollusks [ Monopiacophora and Bellerophontina ] of the Cincinnati Arch Region - Washington United States Government Printing Office 1992 - U.S. Geological Survey Professional Paper 1066-0 .
Monoplacophora, Fossil - Middle West
Archeogastropoda, Fossil - Middle West
Paleontology - Ordocician
Paleontology - Middle West
Middle and Upper Ordovician Symmmetrical Univaled Mollusks [ Monopiacophora and Bellerophontina ] of the Cincinnati Arch Region - Washington United States Government Printing Office 1992 - U.S. Geological Survey Professional Paper 1066-0 .
Monoplacophora, Fossil - Middle West
Archeogastropoda, Fossil - Middle West
Paleontology - Ordocician
Paleontology - Middle West