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| Valencia-Hernández, Ángel Alberto, Goyenechea, Irene and Castillo-Cerón, Jesús Martín Notes on scutellation, length, and distribution of rattlesnakes (Serpentes: Viperidae: Crotalus) in the state of Hidalgo, Mexico. Acta Zool. Mex, 2007, vol.23, no.3, p.29-33. ISSN 0065-1737
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