The Rock River country of northern Illinois
By: by Deette Rolfe.
Publisher: Jeffersons Printing & Stationery Co.]
Published: 1929
Place of publication: Urbana, Ill; [Springfield
Language: eng
Number of pages: 58
Subjects: Geology -- Illinois -- Rock River Valley.
Notes: Bibliography: p. [59]
At head of title: State of Illinois.  Department of Registration and Education.