Trask, C. B., & Jacobson, R. J. (1990). Geologic map of the Creal Springs quadrangle, Illinois. Illinois Dept. of Energy and Natural Resources, Illinois State Geological Survey.
Chicago Style (17th ed.) CitationTrask, C. Brian, and R. J. Jacobson. Geologic Map of the Creal Springs Quadrangle, Illinois. Champaign, Ill.: Illinois Dept. of Energy and Natural Resources, Illinois State Geological Survey, 1990.
MLA (9th ed.) CitationTrask, C. Brian, and R. J. Jacobson. Geologic Map of the Creal Springs Quadrangle, Illinois. Illinois Dept. of Energy and Natural Resources, Illinois State Geological Survey, 1990.
Warning: These citations may not always be 100% accurate.