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II.—The Geology of Illinois - II—The Geology of Illinois.
Published online by Cambridge University Press: 01 May 2009
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References
1 Geology of Wisconsin, by J. Hall and J. D. Whitney, 1862, p. 114.
2 Geological Report of Kentucky (Owen), vol. iv., p. 331. Amer. Journ. Sci., ii. vol. xxx., p. 367.