Caves of Illinois
By: J Harlen Bretz [and] S.E. Harris, Jr.
Contributors: Harris, Stanley Edwards, joint author.
Series: Report of investigations - Illinois State Geological Survey ;; no. 215
Publisher: Illinois State Geological Survey
Published: 1961
Place of publication: Urbana
Language: eng
Number of pages: 87
Subjects: Caves -- Illinois.
Notes: Bibliography: p.87.