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References
Societal Value of Geologic Maps, by Richard L. Bernknopf and others, 1991: U.S. Geological Survey Circular 1111, 53 p.
Geologic Mapping for the Future of Illinois, 1992: Illinois State Geological Survey Special Report 1, 49 p.
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What is a Geologic Map Used For? Why are Geologic Maps Important? What Do All Those Lines, Colors, and Symbols Represent? References
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