The following is a list of references used for our website:

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Water-Resources Investigations, Nashville, Tennessee, 1985.  84-4103. <> Accessed 8 November 2012.

Emberton, K. C. 1995. When Shells Do Not Tell: 145 Million Years of Evolution in North America’s Polygyrid Land Snails. With a Revision and Conservation Priorities. The  Academy of Natural Sciences of Philadelphia. Philadelphia, PA, USA. 37(1): 69-110.

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Hickman, C.P. Jr., L.S. Roberts, S.L. Keen, A. Larson, and D.J. Eisenhour.  2012.  Animal diversity.  6th edition.  McGraw Hill, New York, New York, USA.  p 194-200.

Hubricht, L. 1985. The Distributions of the Native Land Mollusks of the Eastern United States.  Field Museum of Natural History, Chicago, Illinois, USA.

Pilsbry, H. A. 1948.  Land Mollusca of North America. The Natural Academy of Sciences of Philadelphia. Philadelphia, PA, USA. 1: 575-578 and 630-631.

Safford, J. M. 1869. Geology of Tennessee. The General Assembly.  Nashville, Tennessee, USA.

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