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Scientific American

July 1, 1972

1 min read

Books, July 1972

Scratches on a Paleolithic eagle bone may be the first calendrical notation

By Philip Morrison

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This article was originally published with the title “Books” in Scientific American Magazine Vol. 227 No. 1 (July 1972), p. 117
doi:10.1038/scientificamerican0772-117

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