On the nature of Polylopia
By: by Ellis L. Yochelson.
Series: Geological Survey professional paper ;; 593-F.; Contributions to paleontology; Geological Survey professional paper ;; 593-F.; Geological Survey professional paper.
Publisher: U.S. Govt. Print. Off.
Published: 1968
Place of publication: Washington
Language: eng
Subjects: Polylopia billingsi.; Paleontology -- Ordovician.
Notes: Bibliography: p. 7.