Columbia subject headings:
Bridges--Dacia--History.
Bridges--Danube River--History.
Dacia--Antiquities, Roman.
Romans--Dacia.
Romans--Romania.
Harvard subject headings:
Bridges--Dacia--History.
Bridges--Danube River.
Dacia--Antiquities, Roman.
Danube River--Bridges--History.
Romania--Antiquities, Roman.
Princeton subject headings:
Bridges--Dacia--History.
Bridges--Danube River--History.
Dacia--Antiquities, Roman.