Columbia subject headings:
Harvard subject headings:
Dobruja (Romania and Bulgaria)--Antiquities, Byzantine.
Excavations (Archaeology)--Dobruja (Romania and Bulgaria)
Princeton subject headings:
Bulgaria--Antiquities.
Dobruja (Romania and Bulgaria)--Antiquities.
Excavations (Archaeology)--Bulgaria--Dobruja.
Excavations (Archaeology)--Romania--Dobruja.
Romania--Antiquities.