Paleozoic origin of the cycads
By: by Sergius H. Mamay.
Series: Geological Survey professional paper ; 934; Geological Survey professional paper ;; 934.
Publisher: U.S. Govt. Print. Off.
Published: 1976
Place of publication: Washington
Language: eng
Number of pages: 48
Subjects: Cycads, Fossil -- Southwest, New.; Paleobotany -- Paleozoic.; Paleobotany -- Southwest, New.
Notes: Bibliography: p. 44-46.
Includes index.