Some fossil plant types of Illinois
Subtitle: a restudy of the Lesquereux types in the Worthen collection of the Illinois state museum, augmented by descriptions of new species from Mazon creek
By: by Raymond E. Janssen.
Contributors: Illinois State Museum. Worthen Collection.
Series: Illinois State Museum. Scientific papers -- v. 1.; Scientific papers (Illinois State Museum) -- v. 1.
Published: 1940
Place of publication: Springfield, Ill
Language: eng
Number of pages: 124
Subjects: Lesquereux, Leo, -- 1806-1889.; Paleobotany -- Illinois.
Other titles: Fossil plant types of Illinois.
Notes: At head of title: State of Illinois ... Department of registration and education ... Division of the Illinois state museum ...

Plates accompanied by 15 leaves of descriptive letterpress not included in paging.

"Printed by authority of the state of Illinois."

Issued also as thesis (Ph. D.) University of Chicago.

Bibliography: p. 105-116.