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1.
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The concise knowledge library: natural history Lydekker, Richard
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2.
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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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3.
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Pathophysiology of cholesterol gallstone disease Uribe, M - MendezSánchez, N - PoncianoRodríguez, G - Cárdenas-Vázquez, R
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4.
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New strategy for controlling human cysticercosis Flisser, A - Sarti, E - Schantz, P
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