Title: Krai︠a︡t na Vtoroto bŭlgarsko t︠s︡arstvo i sŭdbata na Zlatogradskii︠a︡ raĭon
Subjects: Historians, History, Research, Sources, Middle Ages, Medieval Civilization, Excavations (Archaeology), Antiquities
Places: Bulgaria, Zlatograd Region, Perperek Site
People: Machiel Kiel