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1.
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Evolution of seasonal ecological niches in the Passerina buntings (Aves : Cardinalidae) MartínezMeyer, E - Peterson, AT - Navarro Sigüenza, Adolfo Gerardo
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2.
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Population dynamics of Mammillaria magnimamma Harworth. (Cactaceae) in a lava-field in central Mexico Valverde-Valdés, María Teresa - Quijas, S - López-Villavicencio, M - Castillo-Argüero, Silvia
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