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Stebbins, R.C. 2003 A field guide to western reptiles and amphibians. 3rd edition. Houghton Mifflin Company, Boston & New York. 533 pp.

Stebbins, R.C. 1985 A field guide to western reptiles and amphibians. 2nd rev. ed. Houghton Mifflin Co., Boston. 336 pp.