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1.
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Recent progress in biotechnology of Mexican medicinal plants Villarreal, ML - Nicasio, P - Rojas, G - Alvarez, L - Quintero, R
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2.
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A contribution to the knowledge of the l fauna of El Petén, Guatemala Stuart, Laurence Cooper
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3.
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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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4.
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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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5.
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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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6.
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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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7.
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Comparing the use of indigenous knowledge with classification and ordination techniques for assessing the species composition and structure of vegetation in a tropical forest Pineda, JB - Valdes-Valadez, G - Hernández-Stefanoni, JL
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8.
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Diversidad protozoológica de México. II. Especies asociadas a moluscos López-Ochoterena, E.
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9.
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Circulación del Golfo de México Zambrano-Salgado, L. - Portilla-Casillas, J. - Rendón-Villalobos, R. - Jaimes de la Cruz, B. - Vidal, F. V. - Vidal, V. M. V. - Rodríguez-Espinosa, P. F.
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10.
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Methods of biogeographic analysis and their application to the distribution of Mexican gymnosperms Contreras-Medina, R
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