Columbia subject headings:
Harvard subject headings:
Aachen (Germany)--Antiquities, Roman.
Architecture, Roman--Germany--Aachen.
Baths, Roman--Germany--Aachen.
Excavations (Archaeology)--Germany--Aachen.
Princeton subject headings:
Aachen (Germany)--Antiquities, Roman.
Architecture, Roman--Germany--Aachen.
Baths, Roman--Germany--Aachen.
Excavations (Archaeology)--Germany--Aachen.