Some unusual natural areas of Illinois
By: Robert A. Evers,  Lawrence M. Page.
Contributors: Page, Lawrence M.; Illinois. Natural History Survey Division
Series: Biological notes -- no. 100
Publisher: State of Illinois, Dept. of Registration and Education, Natural History Survey Division
Published: 1977
Place of publication: Urbana, Ill
Language: eng
Number of pages: 47
Subjects: Natural areas -- Illinois; Natural history -- Illinois
Notes: Cover title.

"June 1977."

Includes bibliographical references (p. 42-43).