Spechts Ferry (Middle Ordovician) bryozoan fauna from Illinois, Wisconsin, and Iowa
By: T.G. Perry
Contributors: Illinois State Geological Survey
Series: Illinois State Geological Survey. Circular -- 326; Circular (Illinois State Geological Survey) -- 326.
Publisher: State of Illinois, Dept. of Registration and Education, Division of the State Geological Survey
Published: 1962
Place of publication: Urbana, Ill
Language: eng
Number of pages: 36
Subjects: Fossil Bryozoa; Paleontology
Notes: Cover title.

Includes bibliographical references (p. 34-36).