Этот отрывок взят из: Brian Fagan. Clash of Cultures. Walnut Creek, Calif.: Altamira Press, 1998. Chapter 16.
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По данным: Alexander T. Wilson. Isotope Evidence for Past Climatic and Environmental Change // Rotberg and Rabb. Climate and History. P. 215–232. См. также: Richard H. Grove. Ecology, Climate, and Empire: Colonialism and Global Environmental History 1400–1940. Cambridge, Eng.: White House Press, 1997.
