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Three noteworthy colubrids from southern Sonora, Mexico M A Nickerson and H L Heringhi Great Basin Naturalist 26:136-140 (1966) http://biostor.org/reference/1231 Page images from the Biodiversity Heritage Library, http://www.biodiversitylibrary.org/ , made available under a Creative Commons Attribution-Noncommercial License http://creativecommons.org/licenses/by-nc/2.5/
