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The Cradle of American Man
A book by Arthur Posnansky documenting his 50-year research on Tiwanaku archaeological site in Bolivia.
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"He spent 50 years investigating this site. He dated it at 15,000 BC... I have a copy of his books, The Cradle of American Man, it's called."
Attribution: Ben mentions owning and referencing this specific archaeological research book about Tiwanaku, indicating it's part of his research materials.