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2. Baerreis, D. A., Bryson, R. A., and Kutzbach, J. E.: 1976, ‘Climate and Culture in the Western Great Lakes Region’, Midcont. J. Archaeol. 1(1), 39–57.
3. Betancourt, J. L.: 1990, ‘Late Quaternary Biogeography of the Colorado Plateau’, in Betancourt, J. L., Van Devender, T. R., and Martin, P. S., (eds.), Packrat Middens: The Last 40,000 Years of Biotic Change, The University of Arizona Press, Tucson, pp. 259–292.
4. Betancourt, J. L. and Van Devender, T. R.: 1981, ‘Holocene Vegetation in Chaco Canyon, New Mexico’, Science 214, 656–658.
5. Betancourt, J. L., Martin, P. S., and Van Devender, T. R.: 1983, ‘Fossil Packrat Middens from Chaco Canyon, New Mexico: Cultural and Ecological Significance’, in Wells, S. G., Love, D. W, and Gardner, T. W. (eds.), ‘Chaco Canyon Country: A Field Guide to the Geomorphology, Quaternary Geology, Paleoecology, and Environmental Geology of Northwestern New Mexico’, American Geomorphological Field Group, 1983 Field Trip Guide Book, Albuquerque, pp. 207–217.