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Urbana : Illinois State Geological Survey, c1940.
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Urbana : Illinois State Geological Survey, c1936.
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Frankfort, Ky., The Kentucky Geological survey, 1927.
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Urbana, State Geological Survey, 1952.
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Urbana, Ill., Printed by authority of the state of Illinois, 1940.
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Urbana : Printed by authority of the state of Illinois, 1937.
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9.
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New York, McGraw-Hill [1969]
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10.
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Urbana : Illinois State Geological Survey, c1936.
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