Author: Karklins, O.L., 1969.:
Title: The cryptostome Bryozoa from the Middle Ordovician Decorah Shale, Minnesota.
Description: [Minnestota Geol. Surv. Spec. Publ. Ser., 6.] Minneapolis. Pp. vi,121, numerous microphotos on 18 pls., 11 figs., tabs., refs. Orig. wrs.

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