15. Turner F J. The Frontier in American History. New York: Henry Holt and Company Publ., 1920. 375 p.
16. Turner F. J. The Significance of Sections in American Eistory. New York: Henry Holt and Company Publ., 1932. 347 p.
17. Urban W. The Frontier Thesis and the Baltic Crusade // Crusade and Conversion on the Baltic Frontier 1150-1500. London: Routledge, 2017. P 45-71.
18. Wieczynski J. L. Russian Frontier. The Impact of Borderlands upon the Course of Early Russian History. Charlottesville: University Press of Virginia, 1976. 108 p.
19. Wieczynski J. L. The Frontier in Early Russian History // The Russian Review. 1972. Vol. 31, no. 2. P. 110-116.
20. Wieczynski J. L. Toward a Frontier Theory of Early Russian History // The Russian Review. 1974. Vol. 33, no. 3. P. 284-295.
REFERENCES
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15. Turner F J. The Frontier in American History. New York, Henry Holt and Company Publ., 1920, 375 p.
16. Turner F J. The Significance of Sections in American Eistory. New York, Henry Holt and Company Publ., 1932, 347 p.
17. Urban W The Frontier Thesis and the Baltic Crusade. Crusade and Conversion on the Baltic Frontier 1150-1500. London, Routledge, 2017, pp. 45-71.
18. Wieczynski J. L. Russian Frontier. The Impact of Borderlands upon the Course of Early Russian History. Charlottesville, University Press of Virginia, 1976, 108 p.
19. Wieczynski J. L. The Frontier in Early Russian History. The Russian Review, 1972, vol. 31, no. 2, pp. 110-116.
20. Wieczynski J. L. Toward a Frontier Theory of Early Russian History. The Russian Review, 1974, vol. 33, no. 3, pp. 284-295.