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Pennsylvania Univ. laboratory;North America;list;C 14;carbon;dates;isotopes;radioactive isotopes;absolute age
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Southwestern Alaska;university;Yucatan Mexico;Aleutian Islands;Univ. of Pennsylvania laboratories;Pennsylvania;Hawaii;East Pacific Ocean Islands;Oceania;Polynesia;Alaska;list;general listing;United States;Mexico;C 14;carbon;dates;isotopes;radioactive isotopes;absolute age
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