Spechts Ferry (Middle Ordovician) bryozoan fauna from Illinois, Wisconsin, and Iowa.

Bibliographic Details
Main Author:	Perry, Thomas Gregory, 1918-
Format:	Book
Language:	English
Published:	Urbana, [publisher not identified] ; 1962.
Series:	Circular (Illinois State Geological Survey) ; 326.
Subjects:	Bryozoa, Fossil. Paleontology > Ordovician. Paleontology > Middle West.

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