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平成24年7月13日金曜日

BBC News - Home: Early Americans' two-tool tech

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The latest stories from the Home section of the BBC News web site.
thumbnail Early Americans' two-tool tech
Jul 13th 2012, 08:30

Scientists studying how North America was first settled find stone spearheads and darts in Oregon, US, that date back more than 13,000 years.
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