RT Journal Article SR Electronic T1 Radiocarbon from Nuclear Tests JF Science JO Science FD American Association for the Advancement of Science SP 309 OP 314 DO 10.1126/science.130.3371.309 VO 130 IS 3371 A1 Broecker, Wallace S. A1 Walton, Alan YR 1959 UL http://science.sciencemag.org/content/130/3371/309.abstract AB