References

Archer, A. 1939. The Ecology of the Mollusca of the Edwin S. George Reserve, Livingston County, Michigan. Occasional Papers of the Museum of Zoology. University of Michigan Press, Ann Arbor, Michigan, USA 6.

Franzen, D. 1947. Living and Fossil Pupillidae (Gastropoda) of the Sanborn Area, Northwestern Kansas. Transactions of the Kansas Academy of Science 49:416 

McMillan, M and J.C. Nekola and D.W. Larson. 2003. Effects of Rock Climbing on the Land Snail Community of the Niagra Escarpment in Southern Ontario, Canada. Conservation Biology 17:616-621.

Nekola, J. 2003. Terrestrial Gastropod Fauna of Notheastern Wisconsin and the Southern Upper Peninsula of Michigan. American Malacological Bulletin 9

Sterki, V. 1920. Marl Deposits in Ohio and Their Fossil Mollusca. The Ohio Journal of Science. 20:6.

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