Columbia subject headings:
Austria--Antiquities, Roman.
Danube River Valley--Antiquities, Roman.
Roads, Roman--Austria.
Roads, Roman--Danube River Valley.
Harvard subject headings:
Austria--Antiquities, Roman.
Danube River Valley--Antiquities, Roman.
Roads, Roman--Austria
Roads, Roman--Danube River Valley.
Princeton subject headings:
Austria--Antiquities, Roman.
Danube River Valley--Antiquities, Roman.
Roads, Roman--Austria.
Roads, Roman--Danube River Valley.