Biblioteca IFEA
Biblioteca IFEA
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An indian hunters' camp for 20,000 years : a rock shelter in western Pennsylvania was periodically occupied from about 19,000 B.C to A.D 1000 The extreme age of the site bears on the question of when men entered the western hemisphere

By: Contributor(s): Material type: ArticleArticleLanguage: Eng Other classification:
  • Am.Arch A-37
Scientific american 250(5), 1984, p. 130-132, 134,136
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