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2. Bray, J. R.: 1971, ?Vegetationed Distribution, Tree Growth and Crop Success in Relation to Recent Climatic Change?, in Cragg, J. B. (ed.),Advances in Ecological Research 7, pp. 177?233.
3. Betancourt, J. L.: 1984, ?Late Quaternary Plant Zonation and Climate in Southeastern Utah?,Great Basin Natural. 44, 1?35.
4. Berlin, G. L., Ambler, J. R., Hevly, R. H., and Shaber, G. G.: 1977, ?Identification of a Sinagua Agricultural Field by Aerial Thermography, Soil Chemistry, Pollen/Plant Analysis, and Archaeology?,Amer. Antiq. 42, 588?600.
5. Bradley, R. S. and Barry, R. G.: 1973, ?Secular Climatic Fluctuations in Southwestern Colorado?,Month. Wea. Rev. 101, 264?270.