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1.
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A preliminary synthesis of the knowledge on the Mexican Papilionoidea (Lepidoptera : Insecta) Martínez, AL - Fernandez, IV - Gutierrez, AL - Llorente Bousquets, Jorge Enrique
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2.
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Contributions to our knowledge of the duration of life in vertebrate animals Flarer, Stanley Smith
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3.
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demographic trends in the cactaceae Godinez-Alvarez, H - Ortega-Baes, P - Valverde, MT
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