Author: Felix, Ch.J., & Burbridge, P.P., 1967.:
Title: Palynology of the Springer Formation of Southern Oklahoma, U.S.A.
Description: Palaeontology, 10(3): pp. 349-423, many microphotos on 14 plates, refs. Plain new wrappeers. - Mississippian/Pennsylvanian, Upper Carboniferous.

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