506 GUSTAFSON, BRAR, AND MUNIAK 10. D, H. Peirson, United Kingdom Atomic Energy Research Establishment, Harwell, private communication, September 1964. 11, A. J. Cruikshank, G. Cowper, and W. E. Grummitt, Production of Be’ in the Atmosphere, Can. J. Chem., 34: 214-219 (1956). 12. N. Murayama, Meteorological Features of Cosmic Ray Produced Beryllium-7, J. Meteorol. Soc. Japan, Ser. H, 42; 43-52 (1964).

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