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Полонська-Василенко Н. Ukraine-Ruś and Western Europe in 10th-13th centuries (англ.)
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DVMAN
Natalia Polonśka-Vasylenko. Ukraine-Ruś and Western Europe in 10th-13th centuries. London: published by the Association of Ukrainians in Great Britain, Ltd.; printed by Ukrainian Publishers, Ltd., 1964. - 47 pp., illustrations.