Popcov O.M. Hronika vremen «carya Borisa». In Russian/ Poptsov About.M. Chronicle times «king Boris». In Russian, Moscow - landofmagazines.com

TransliterationPopcov O.M. Hronika vremen «carya Borisa». In Russian

In EnglishPoptsov About.M. Chronicle times «king Boris». In Russian, Moscow

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