Klyuchevskiy V.O. Boyarskaya duma drevney Rusi. Pb.,  1919/Klyuchevsky V.O. Boyarskaya duma of ancient Russia. Pb.,  1919 - landofmagazines.com

TransliterationKlyuchevskiy V.O. Boyarskaya duma drevney Rusi. Pb., 1919

In EnglishKlyuchevsky V.O. Boyarskaya duma of ancient Russia. Pb., 1919

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