Explorers of Pre-Columbian America?: The Diffusionist-inventionist Controversy

accept African amateur Amerindian cultures Amerindians ancient anthropologists anti-diffusionist archaeological archaeologists argue arguments artifacts Asia Asian asserts Atlantic authentic Barry Fell Beringia blowgun Brendan brought Carter Celtic Celts century characteristics chicken China Chinese civilizations claims coast Columbian Columbus concepts conclusions considers continent criticism cultists culture diffusion demonstrate diffusionists early Ekholm epigraphers essays European evidence Fell's George F Greenland Heine-Geldern human independent development advocates independent invention inscriptions inventionists islands Jett Jomon Kelley Kensington Stone legends linguistic maize Maya McGlone McKusick medieval megalithic Meggers Mesoamerica migration Newfoundland Norse North America ocean Ogam Old World Olmec origin Pacific petroglyphs plant Polynesian pottery pre-Columbian Pre-Columbian Contacts pre-Columbian transocean pre-Columbian voyages prehistoric probably produced professional region rejects Robert runestones runic sagas sailed scholarly scholars similar Society South suggests sweet potato theories Thor Heyerdahl traits transocean diffusion transpacific travelers Valdivian valid Vikings Vinland Vinland Map visitors West Williams writing