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2. Bonnefield, P.: 1979, Dust Bowl, University of New Mexico Press, Albuquerque, New Mexico.
3. Bowden, M., Kates, R., Kay, P., Riebsame, W., Warrick, R., Johnson, D., Gould, H., and Weiner, D.: 1981, ?The Effect of Climatic Fluctuations on Human Populations: Two Hypotheses?, in T. M. L. Wigley, M. J. Ingram, and G. Farmer (eds.), Climate and History: Studies in Past Climates and Their Impacts on Man, Cambridge University Press, Cambridge.
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