The glacial boundary in southern Illinois
By: H.B. Willman and John C. Frye.
Contributors: Frye, John Chapman, 1912-
Series: Circular / Illinois State Geological Survey Division ;; 511; Circular (Illinois State Geological Survey) ;; 511.
Publisher: Illinois Institute of Natural Resources; Illinois State Geological Survey Division
Published: 1980
Place of publication: [Chicago]; Urbana, Ill
Language: eng
Number of pages: 23
Subjects: Glacial epoch -- Illinois.
Notes: Bibliography: p. 23.