APA (7th ed.) Citation
Illinois State Geological Survey & Leighton, M. (1931). Bulletin. Illinois state geological survey.
Chicago Style (17th ed.) Citation
Illinois State Geological Survey and M.M Leighton. Bulletin. Urbana, Ill: Illinois state geological survey, 1931.
MLA (9th ed.) Citation
Illinois State Geological Survey and M.M Leighton. Bulletin. Illinois state geological survey, 1931.
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