Columbia subject headings:
Harvard subject headings:
Excavations (Archaeology)--Germany--Congresses.
Fortification, Roman--Germany--Congresses.
Germany--Antiquities, Roman--Congresses.
Limes (Roman boundary)--Germany--Congresses.
Limes (Roman boundary)--Germany--Rhine Province--Congresses.
Rhine Province (Germany)--Antiquities, Roman--Congresses.
Rome--History, Military--Congresses.
Princeton subject headings:
Limes (Roman boundary)--Germany--History--Congresses.