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WikiPedia: Pertukaran Columbus http://news.discovery.com/history/lager-yeast-paga... http://qz.com/580139/thanks-columbus-the-true-stor... http://www.scientificamerican.com/article/case-clo... http://scitizen.com/biotechnology/maize-streak-vir... http://www.shmoop.com/columbian-exchange/ http://www.smithsonianmag.com/history/alfred-w-cro... http://www.wwnorton.com/college/history/worlds-tog... http://researchnews.osu.edu/archive/suprtubr.htm //citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1... http://www.botgard.ucla.edu/html/botanytextbooks/e...