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1.
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The Genera of Phyllomedusine Frogs (Anura : Hylidae) [electronic resource] / William Edward Duellman by
  • Duellman, William Edward, 1930-
Publication details: Project Gutenberg, 2010
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2.
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Descriptions of Two Species of Frogs, Genus Ptychohyla : Studies of American Hylid Frogs, V [electronic resource] / William Edward Duellman by
  • Duellman, William Edward, 1930-
Publication details: Project Gutenberg, 2010
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3.
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A Taxonomic Study of the Middle American Snake, Pituophis deppei [electronic resource] / William Edward Duellman by
  • Duellman, William Edward, 1930-
Publication details: Project Gutenberg, 2010
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4.
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A Review of the Frogs of the Hyla bistincta Group [electronic resource] / William Edward Duellman by
  • Duellman, William Edward, 1930-
Publication details: Project Gutenberg, 2010
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5.
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A New Subspecies of Lizard, Cnemidophorus sacki, from Michoacan, Mexico [electronic resource] / William Edward Duellman by
  • Duellman, William Edward, 1930-
Publication details: Project Gutenberg, 2010
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6.
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The Amphibians and Reptiles of Michoacán, México [electronic resource] / William Edward Duellman by
  • Duellman, William Edward, 1930-
Publication details: Project Gutenberg, 2010
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7.
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Descriptions of New Hylid Frogs From Mexico and Central America [electronic resource] / William Edward Duellman by
  • Duellman, William Edward, 1930-
Publication details: Project Gutenberg, 2010
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8.
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Systematic Status of the Colubrid Snake, Leptodeira discolor Gunther [electronic resource] / William Edward Duellman by
  • Duellman, William Edward, 1930-
Publication details: Project Gutenberg, 2011
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9.
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A Review of the Middle American Tree Frogs of the Genus Ptychohyla [electronic resource] / William Edward Duellman by
  • Duellman, William Edward, 1930-
Publication details: Project Gutenberg, 2011
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10.
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Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala [electronic resource] / William Edward Duellman by
  • Duellman, William Edward, 1930-
Publication details: Project Gutenberg, 2011
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11.
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A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico [electronic resource] / William Edward Duellman by
  • Duellman, William Edward, 1930-
Publication details: Project Gutenberg, 2011
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