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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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9.
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How motivation, time devoted to speaking practice, and teaching speaking methodology interfere in the oral performance in intermediate English students at the Foreign Language Department of the University of El Salvador in the Term I-2011. Aguilar Mejía, Sandra Beatriz - Osorio Driotez, Elena Roxana - León Rivera, Ronald Omar
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10.
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How non-participation influences in the oral proficiency development of the students from intermediate intensive english I courses in the Foreign Language Department, at the University of El Salvador, during the semester II -2011. Hernández Hernández , Ileana Patricia - Marcía Herrera , Rosa Arminda - Orantes Pérez , Jocelyn Marcela
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