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Blum J. Lord and Peasant in Russia from the Ninth to the Nineteenth Century. Princeton, 1961. P. 367; Dukes P. Catherine the Great and the Russian Nobility. P. 11; Kahan A. The Costs of «Westernisation» in Russia: The Gentry and the Economy in the Eighteenth Century // Slavic Review. 1966. Vol. 25. № 1. P. 42.