References
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Boss, K.J. 1982. Mollusca. Pages 945-1166 in S. P. Parker, editor. Synopsis and classification of living organisms. McGraw-Hill, Inc., USA.
Burch, J.B. 1962. How to know the eastern land snails. WM. C. Brown Company Publishers, Dubuque, Iowa, USA.
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Hubricht, L. 1985. The distribution of the native land mollusks of the eastern United States. Field Museum of Natural History, USA.
Jackson, R. 1948. New subspecies of Helicostyla from Mindoro, and of Polygyra from Florida. Nautilus 1948:40-41.
Morton, J. E. and C.M. Yonge. 1964. Classification and structure of the Mollusca. Pages 1-58 in K.M. Wilbur and C.M. Yonge, editors. Physiology of Mollusca. Academic Press Inc., New York, New York, USA.
Perez, K.E. 2008. A guide to terrestrial gastropod identification. Pages 43-48 in K.E. Perez, J. Cordeiro, J. Gerber, editors. American Malacological Society Terrestrial Gastropod Identification Workshop. Southern Illinois University, Carbondale.
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Tompa, A. S. 1984. The Mollusca. Pages 47-127 in K. M. Wilbur, editor. Land snails (stylommatophora). Academic press, Inc., London, United Kingdom.
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