Crimean Khan Mehmed Giray IV Embassies for Sweden, Denmark and Austria in 1655 by Ya. O. Fedoruk

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Ivan Krypyakevych and Omelyan Pritsak. (On the Source of I. Krypyakevych Domestic Archives) by Ya. O. Fedoruk

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"Mercurius Politicus" on Bohdan Khmel'nyts'ky's 1655 Autumn Campaign and Its Consequences by Ya. O. Fedoruk

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Archive of Ivan Krypyakevych by Ya. O. Fedoruk

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The new documents the history of the Cossacks end XVI - early XVII centuries (Reference: Documents Ukrainian Cossacks XVI - first half XVII centuries: universals, correspondence, a... by Ya. O. Fedoruk

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Vasyl Dubrovsky's Lost Article "Bohdan Khmelnytsky i Turechchyna: (Z pryvody statei Prof. Jana Rypky" by Ya. O. Fedoruk

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An Unrealized Project concerning the Editing of Kateryna Hrushevska's "Ukrainian Epic Songs" ("Ukrains'ki narodni dumy") in th... by Ya. O. Fedoruk

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The Principality of Transylvania in 1656: Forming a Policy Choice between Ukraine, Sweden, and the Polish-Lithuanian Commonwealth by Ya. O. Fedoruk

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On the Rehabilitation of Serhii Shamrai by Ya. O. Fedoruk

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The Ukrainian Problem on the Treaty of Vilnius Between the Polish-Lithuanian Commonwealth and Russia in the Fall of 1656 by Ya. O. Fedoruk

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The East European Political Crisis at the Middle of XVII in Historiography by Ya. O. Fedoruk

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