Search for: [Subject and Keywords = history of Bulgaria] OR [Subject and Keywords = history of Serbia] OR [Subject and Keywords = Bułgaria \-\- historia \[KABA\]] OR [Subject and Keywords = Serbia \-\- historia \[KABA\]] OR [Title = Pis'ma ob istorìi Serbov i Bolgar. Vyp. 2] OR [Title = Pis'ma ob istorìi Serbov i Bolgar. Vyp. 2] OR [Creator = Gil'ferding, Aleksandr Feodorovič \(1831–1872\)] OR [Creator = Gil'ferding, Aleksandr Feodorovič \(1831–1872\)]