1. Leipunsky, O. I., Atomic Energy (U.S.S.R.) English translation, 12, 530 (1957).
2. Rep. U.N. Sci. Comm. Effect of Atomic Radiation, No. 16 (A/5216) (United Nations, New York, 1962).
3. Münnich, K. O., Naturwiss., 6, 211 (1963).
4. Rafter, T. A., and Fergusson, G. J., Science, 126, 577 (1957).
5. Broecker, Wallace S., and Olson, Edwin A., Amer. J. Sci. Radiocarbon, Supp., 1, 111 (1959).