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1.- ORIGIN AND ENVIRONMENTAL SETTING OF ANCIENT AGRICULTURE IN THE LOWLANDS OF MESOAMERICA
AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE; WASHINGTON, DC; USA; UNITED STATES, 2001
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2.- Sunflower (Helianthus annuus L.) as a pre-Columbian domesticate in Mexico; replies
National Academy of Sciences; Washington, DC; USA; United States, 2008
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