Trend - Surface Analysis of the Thickness of the High Bridge Group (Middle Ordovician) of Central Kentucky and Its Bearing on the Nature of the Post - Knox Unconformity (FROM: United States Geological Survey Professional Paper 800-B. Geological Survey Research 1972, Chapter B, pp. B25-B33).
Wolcott, D. E., E. R. Cressman and J. J. Connor.
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