ScienceJohn Michels (Journalist) 1958 |
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Стр. 73
... Radiocarbon dates obtained on archeological samples by the black - carbon method . All ages are given in radiocarbon years before the present . The year of assay is given in parentheses below the radiocarbon age . Specific locations of ...
... Radiocarbon dates obtained on archeological samples by the black - carbon method . All ages are given in radiocarbon years before the present . The year of assay is given in parentheses below the radiocarbon age . Specific locations of ...
Стр. 1424
... radio- carbon dating as a research tool is still blunt because of our difficulties with the " geobiochemical ... radiocarbon dates ( samples W - 607 , -651 , -652 ) of about 8500 years ago , or 6500 в.с. , as the prob- able true ...
... radio- carbon dating as a research tool is still blunt because of our difficulties with the " geobiochemical ... radiocarbon dates ( samples W - 607 , -651 , -652 ) of about 8500 years ago , or 6500 в.с. , as the prob- able true ...
Стр. 1476
... radiocarbon dates measured at the U.S. Geological Survey radiocarbon labora- tory during the period between 1 July 1955 and 7 November 1956 ( 1 ) . The laboratory procedure , in which acetylene gas is used , has remained essentially the ...
... radiocarbon dates measured at the U.S. Geological Survey radiocarbon labora- tory during the period between 1 July 1955 and 7 November 1956 ( 1 ) . The laboratory procedure , in which acetylene gas is used , has remained essentially the ...
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Humin analysis of 702 | 3 |
Hawaii book review of Flora Hawaiiensis | 5 |
Infrared absorption spectra of steroids | 9 |
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