Columbia subject headings:
Harvard subject headings:
Excavations (Archaeology)--Germany--Rhineland--Congresses.
Rhineland (Germany)--Antiquities--Congresses.
Urban archaeology--Germany--Rhineland--Congresses.
Princeton subject headings:
Excavations (Archaeology)--Germany--North Rhine-Westphalia--Congresses.
Urban archaeology--Germany--North Rhine-Westphalia--Congresses.