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|a 970-15-0781-9
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|a Margalef, Ramón
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|a Teoría de los Sistemas Ecológicos /
|c Ramon Margalef
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|a 2a ed.
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|a México,
|b Alfaomega,
|c 2002
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|a 290 p.
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|x ECOLOGIA
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|9 332
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