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A contribution to the knowledge of the l fauna of El Petén, Guatemala Stuart, Laurence Cooper
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2.
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Third addition to a knowledge of the Batrachia and Reptilia of Costa Rica Cope, Edward Drinker
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3.
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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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4.
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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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5.
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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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6.
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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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7.
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Cora ethnozoology, l knowledge; a bio-ecological and cross cultural approach Malkin, Borys
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8.
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Sumu ethnozoology: herpetological knowledge Malkin, Borys
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9.
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Additions to the knowledge of the herpetofauna of Oaxaca, Mexico Hobart M Smith
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10.
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An analysis of the knowledge of the turtle fauna of Mexico Rozella B Smith - Hobart M Smith
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