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来源: www.loc.gov (Library of Congress — Columbus collections and early printed works), www.history.navy.mil (Naval History and Heritage Command — Columbus voyages), www.si.edu (Smithsonian Institution — Age of Discovery resources), www.neh.gov (National Endowment for the Humanities — Columbus and the Americas), www.archives.gov (National Archives — Treaty of Tordesillas materials), www.pbslearningmedia.org (PBS LearningMedia — Age of Exploration)