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A contribtion to our knowledge of the herpetofauna of the Mexican state of Aguascalientes Anderson, James Donald - William Z Lidicker, Jr
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Contributions to the knowledge of the systematic arrangement and anatomy of certain genera and species of Squamata Beddard, Frank E
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A contribution to the knowledge of the l fauna of El Petén, Guatemala Stuart, Laurence Cooper
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Second addition to the knowledge of the Batrachia and Reptilia of Costa Pica Cope, Edward Drinker
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Third addition to a knowledge of the Batrachia and Reptilia of Costa Rica Cope, Edward Drinker
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Contributions to our knowledge of the duration of life in vertebrate animals Flower, Stanley S
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Addresses in memory of Edward Drinker, Cope delivered at the meeting in the hall of the American Fhilosophical Society held at Philadelphiafor promotig useful knowledge Anonymous
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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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Main factors that determine students´ level of proficiency in English Intermediate I of the Foreign Languages Department of the University of El Salvador during the semester II-2011. Pérez González, Claudia Patricia - Orellana Villeda, Ingrid Mariela - Figueroa Urbano, Vicky Evangelina - Ortiz Rivera, Ana Blanca Guadalupe
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10.
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Different factors influencing students’ in-class oral active participation, considering english domain in students of Intermediate English I, at the Foreign Languages Department. Rivera Marroquin, Francisco - Cuellar Melara, Josue Gustavo - Miranda Diaz, Joaquin Alexander - Chavez Aquino, Gerson Efrain
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