1. B. J. Mason,Clouds, Rain and Rainmaking (Cambridge University Press, 1962).
2. University of toronto,Proceedings Internat. Confer. Cloud Physics, Toronto, Aug. 26?30 (1968), Amer. Meteorol. Soc., Boston.
3. L. M. Le Cam andJ. Neyman,Proceedings Fifth Berkeley Symp. Math. Stat. and Probability. Vol. V. Weather Modification (Univ. Calif. Press, Berkeley 1967).
4. State University of New York at Albany,Proceedings First Natl. Conf. on Weather Modification, April 28-May 1 (1968), Amer. Meteorol. Soc., Boston.
5. C. N. Davies,Recent Advances in Aerosol Research (Pergamon Press, London 1964).