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→Bibliografia
== Bibliografia ==
== Bibliografia ==
* Shosteck, Robt. 1994. Flowers and Plants. An International Lexicon with Biographical Notes. Quadrangle/The New York Times Book Co. 329 pp.
* [https://agresearchmag.ars.usda.gov/2002/jun/rubber Wood, Marcia. June 2007. Sunflower Rubber? Agricultural Research. USDA.]
* [https://agresearchmag.ars.usda.gov/2002/jun/rubber Wood, Marcia. June 2007. Sunflower Rubber? Agricultural Research. USDA.]