PT - JOURNAL ARTICLE AU - Arnold, J. R. AU - Libby, W. F. TI - Age Determinations by Radiocarbon Content: Checks with Samples of Known Age AID - 10.1126/science.110.2869.678 DP - 1949 Dec 23 TA - Science PG - 678--680 VI - 110 IP - 2869 4099 - http://science.sciencemag.org/content/110/2869/678.short 4100 - http://science.sciencemag.org/content/110/2869/678.full SO - Science1949 Dec 23; 110