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1.
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Third addition to a knowledge of the Batrachia and Reptilia of Costa Rica Cope, Edward Drinker
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2.
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A new dicrocoeliid (Digenea: Dicrocoeliinae) parasite of rodents from Tlaxcala, Mexico. Lamothe-Argumedo, R. - Falcon-Ordaz, J. - Garcia-Prieto, L. - Fernandez-Fernandez, J.
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3.
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A contribution to the knowledge of the l fauna of El Petén, Guatemala Stuart, Laurence Cooper
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4.
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Some additions to the knowledge of the anatomy, principally of the vascular system, of Hatteria, Crocodilus and certain Lacertilia Beddard, Frank E
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5.
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Second addition to the knowledge of the Batrachia and Reptilia of Costa Pica Cope, Edward Drinker
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6.
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Contributions to our knowledge of the duration of life in vertebrate animals Flower, Stanley S
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7.
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A contribution to a knowledge of the herpetology of a portion of the savanna region of central Petén, Guatemala Stuart, Laurence Cooper
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8.
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Biogeography, current knowledge and conservation of threatened vascular plants characteristic of Mexican temperate forests Vega, IL - Ayala, OA - Contreras-Medina, R - Vargas, AP
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9.
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The concise knowledge library: natural history Lydekker, Richard
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10.
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Contributions to our knowledge of the duration of life in vertebrate animals Flarer, Stanley Smith
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