Middle and Late Ordovician solitary rugose corals of the Cincinnati Arch region / by Robert J. Elias ; prepared in cooperation with the Commonwealth of Kentucky, University of Kentucky, Kentucky Geological Survey (Contributions to the Ordovician paleontology of Kentucky and nearby states) (Geological Survey professional paper ; 1066-N)
Middle and Late Ordovician solitary rugose corals of the Cincinnati Arch region / by Robert J. Elias ; prepared in cooperation with the Commonwealth of Kentucky, University of Kentucky, Kentucky Geological Survey
(Contributions to the Ordovician paleontology of Kentucky and nearby states) (Geological Survey professional paper ; 1066-N)