- Publication venue
- Illinois State Geological Survey
- Publication date
- 01/01/1970
- Field of study
Ope
- Publication venue
- Urbana, IL : Illinois State Geological Survey
- Publication date
- 01/01/1961
- Field of study
Cover title.Bibliography: p. 8
- Publication venue
- Champaign, Ill.: Illinois State Geological Survey
- Publication date
- 01/01/1981
- Field of study
- Publication venue
- Illinois State Geological Survey
- Publication date
- 01/01/1968
- Field of study
Ope
- Publication venue
- Champaign, Ill.: Illinois State Geological Survey
- Publication date
- 01/01/1981
- Field of study
- Publication venue
- Urbana, IL : Illinois State Geological Survey
- Publication date
- 01/01/1970
- Field of study
Cover title.Bibliography: p. 11-12
- Publication venue
- Champaign, IL : Illinois State Geological Survey
- Publication date
- 01/01/1985
- Field of study
Includes bibliographical references (p. 8)
- Publication venue
- Urbana: Illinois State Geological Survey
- Publication date
- 01/01/1968
- Field of study
- Publication venue
- Urbana: Illinois State Geological Survey
- Publication date
- 01/01/1972
- Field of study
- Publication venue
- Champaign, Ill. (615 E. Peabody Dr., Champaign 61820): Illinois State Geological Survey
- Publication date
- 01/01/1990
- Field of study