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Reptiles collected in Salvador for the California Institute of Technology - Schmidt, Karl Patterson, 1890 -1957 (1928)

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The reptiles of western North America, an account of the species known to inhabit California and Oregon, Washington, Idaho, Utah, Nevada, Arizona, British Columbia, Sonora and Lower California - Van Denburgh, John, 1872 -1924 (California Academy of Sciences, 1922)

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Revue suisse de zoologie - Muséum d'histoire naturelle de Genève. (Kundig [etc.], 1956)

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The rod and gun and American sportsman ([Rod and Gun Association, 1876)

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Serpientes venenosas de Costa Rica: sus venenos seroterapia anti-ofídica - Picado Twight, Clodomiro (Alsina, 1931)

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Sex chromosomes in teiid whiptail lizards (genus Cnemidophorus) - Cole, Charles J. (American Museum of Natural History, 1969)

Sexual dimorphism in the animal kingdom, a theory of the evolution of secondary sexual characters - Cunningham, J. T. (Joseph Thomas), 1859 -1935 (Black, 1900)

Sexual size differences in reptiles - Fitch, Henry S. (Henry Sheldon) 1909 -2009 (University of Kansas, 1981)

sheng wu ming cheng he sheng wu xue shu yu de ci yuan - Jaeger, Edmund C. (Edmund Carroll) 1887 -1983 (ke xue chu ban she, 1979)

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