Erratum.
The name of Alberto Ruz Lhuillier was misspelled Buz l'Huiller on page 136, column 2, line 31 in the article "Groningen Radiocarbon Dates II" by H. de Vries, G. W. Barendsen, and H. T. Waterbolk [Science 127, 129 (17 Jan. 1958)].