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Encyclopedia Dubuque



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JAGNOW, David. (Dubuque, IA- ). Jagnow was one of two discoverers of Coldwater Cave believed to be the largest cave ever discovered in Iowa. Water inside the cave remains a constant 47 degrees with the air temperature only a few degrees warmer.



Iowa Underground: A Guide to the State's Subterranean Treasures, p. 86 - Google Books Result books.google.com/books?isbn=1931599394

Oneota Flow: The Upper Iowa River and Its People, p. 74 74 - Google Books Result books.google.com/books?isbn=1587298368