Circulars. 499. Nuclear data, collection of experimental values of half-lives, radiation energies, relative isotopic abundances, nuclear moments, and cross sections, supp. 2 (July 1950-Jan. 1951) [with lists of additions to old references and references for supp. 2]; compiled by Katharine Way, Gladys Fuller, Marion Wood, Karin Thew, and Alice Jurgens.