Research of Western European old printing books at V. I. Vernad¬skyi National Library of Ukraine von H. I. Kovalchuk

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Stepan Yosypovych Petrov – the head of Rare and Valuable Books Department of the State Public Library of Ukrainian SSR (1949–1961) von H. I. Kovalchuk

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The research of the history of book culture in Ukraine von H. I. Kovalchuk

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"Kyiv" letters to I. P. Krypiakevych (the autumn of 1947) von H. I. Kovalchuk

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Attribution and expertise as focus areas in libraries with retrospective rare and valuable editions von H. I. Kovalchuk

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