Scheihing, Mark H. and Ralph L. Langenheim, Jr.
Lingulid, Rhynchonellid, and Spiriferid Brachiopods from the Shumway Cyclothem, Mattoon Formation, Pennsylvanian of Illinois
[071-17] Lingulid, Rhynchonellid, and Spiriferid Brachiopods from the Shumway Cyclothem, Mattoon Formation, Pennsylvanian of Illinois
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