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2. Bequaert, J.C., Miller, W.B., 1973. The Mollusks of the Arid Southwest, with an Arizona Check List. University of Arizona Press, Tucson, 271 pp.
3. Bevington, P.R., Robinson, D.K., 1992. Data Reduction and Error Analysis for the Physical Sciences. McGraw-Hill, Boston, MA, 328 pp.
4. Reliable late-Pleistocene stratigraphic ages and shorter groundwater travel times from 14C in fossil snails from the southern Great Basin;Brennan;Quat. Res.,1997
5. Burch, J.B., 1962. How to Know the Eastern Land Snails. Brown, Dubuque, IA, 213 pp.