Karklins, O. L. (1983). Ptilodictyoid cryptostomate Bryozoa from the Middle and Upper Ordovician rocks of Central Kentucky. Memoirs of the Paleontological Society, 14: 1-31
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Karklins, O. L.
1983
Ptilodictyoid cryptostomate Bryozoa from the Middle and Upper Ordovician rocks of Central Kentucky