Columbia subject headings:
Bulgaria--Antiquities, Roman.
Excavations (Archaeology)--Bulgaria--Nicopolis ad Istrum (Extinct city)
Nicopolis ad Istrum (Extinct city)
Romans--Bulgaria--Nicopolis ad Istrum (Extinct city)
Harvard subject headings:
Bulgaria--Antiquities, Roman.
Byzantine antiquities.
Classical antiquities.
Excavations (Archaeology)--Bulgaria--Nicopolis ad Istrum (Extinct city)
Nicopolis ad Istrum (Extinct city)
Romans--Bulgaria--Nicopolis ad Istrum (Extinct city)
Princeton subject headings:
Bulgaria--Antiquities.
Excavations (Archaeology)--Bulgaria--Nicopolis ad Istrium (Extinct city).
Nicopolis ad Istrum (Extinct city)