1. Peterson, J. T. and Bryson, R. A.: Proc. of First Nat’l Conf. Wea. Mod., Albany, N.Y. (1968).
2. Risebrough, R. W., Huggett, R J., Griffen, J. J., and Goldberg, E. D.: Science
159, 3820 (1968).
3. Davitaia, F. F.: Trans. Soviet Acad. Sci., Geogr. Ser. No. 2 (1965).
4. Davitaia, F. F.: Personal Communication, Georgian Acad. of Science, Tbilisi, U.S.S.R. (1968). He also reported a similar trend of dust concentration from the Altai Mts.
5. McCormick, R. A. and Ludwig, J. H.: Science
156, 1358 (1967).