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Об Англии (включая Уэльс): E.A. Wrigley and Roger Schofield, Population History of England, 1341–1871: A Reconstruction (Cambridge: Cambridge University Press, 1,989), 529. О России: Livi-Bacci, ibid. О Китае: James Lee and Wang Keng, One Quarter of Humanity: Malthusian Mythology and Chinese Realities (Cambridge, MA: Harvard University Press, 1999), 28.