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  1. Variation in scales in Dermophis mexicanus (Amphibia, Gymnophiona) : are scales of systematic utility? / Maravalee H. Wake, Kristen M. Nygren.
    By: Wake, Marvalee H. - Nygren, Kristen M. - Field Museum of Natural History.
    Publication info: Chicago :Field Museum of Natural History,1987.
    Contributed by: University of Illinois Urbana Champaign
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