Literature Cited

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Burch, J. B. Ph.D. and P. Myers. 2001. Subclass Pulmonata. Animal Diversity Web. <URL: http://animaldiversity.ummz.umich.edu/site/accounts/information/Pulmonata.html>. Accessed on 28 March 2011.

Caldwell, R. S. and D. C. Dourson. 2008. Rare Land Snails of the Cherokee National Forest. Lincoln Memorial University, Tennessee, USA.

Grimm, F. W., R. G. Forsyth, F. W. Schueler, and A. Karstad. 2009. Identifying land snails and slugs in Canada: Introduced species and native genera. Canadian Food Inspection Agency. Pg 53.

Hickman, Jr. C. P., L. S. Roberts, S. L. Keen, A. Larson, and D. J. Eisenhour. 2009. Animal Diversity. McGraw-Hill Companies Inc., New York, USA.

Hubricht, L. 1985. The distributions of the native land Mollusks of the eastern United States. Fieldiana. Pg. 11, 80.

Hyde T. and W. A. Smith. 2009. Tapered Vertigo (Vertigo elatior). Wisconsin Department of Natural Resources. <URL: http://dnr.wi.gov/ORG/LAND/ER/biodiversity/index.asp?mode=info&Grp=24&SpecCode= IMGAS20140>. Accessed 31 March 2011.

Lee, Y. 2007. Special animal abstract for Vertigo elatior (tapered vertigo). Michigan Natural Features Inventory, Lansing, Michigan, USA.

Michigan Natural Features Inventory. 2007. Vertigo elatior: Tapered vertigo. Rare Species Explorer. <URL: http://web4.msue.msu.edu/mnfi/explorer/species.cfm?id=12438>. Accessed 1 April 2011.

Montana Natural Heritage Program. Tapered Vertigo - Vertigo elatior. Montana Field Guide. <URL:  http://fieldguide.mt.gov/detail_IMGAS20140.aspx>. Accessed 23 March 2011.

Myers, P. and J. B. Burch, Ph.D. 2001. Class Gastropoda: gastropods, slugs, and snails. Animal Diversity Web. <URL: http://animaldiversity.ummz.umich.edu/site/accounts/information/Gastropoda.html>. Accessed 25 March 2011.

Nekola, J. C. and B. F. Coles. 2010. Pupillid land snails of eastern North America. American Malacological Bulletin 28:29-57.         

Parker, S. 2011. Characteristics of Kingdom Animalia. eHow: Trusted advice for the curious life. Demand Media, Inc.

Perez, K. E. 2011. Land snails of Wisconsin.  <URL:  http://www.uwlax.edu/biology/faculty/perez/Perez/PerezLab/Research/WIsnails.html>. Accessed 23 March 2011.
 
Pilsbry, H. A. 1948. Land Mollusca of North America (North of Mexico). The Academy of Natural Sciences of Philadelphia 2:521-1086.

Whitaker, W. 2010. William Whitaker's Words. University of Notre Dame. <URL: http://archives.nd.edu/words.html>. Accessed 21 March 2011.

Wisconsin Dept. of Natural Resources. 2009. Tapered Vertigo (Vertigo elatior). <URL:http://dnr.wi.gov/ORG/LAND/ER/biodiversity/index.asp?mode=info&Grp=24&SpecCode=IMGAS20140 >. Accessed 31 March. 2011



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