Columbia subject headings:
Harvard subject headings:
England--Antiquities--Congresses.
Europe, Northern--Antiquities--Congresses.
Excavations (Archaeology)--England--Congresses.
Excavations (Archaeology)--Europe, Northern--Congresses.
Waterfronts--England--Congresses.
Waterfronts--Europe, Northern--Congresses.
Princeton subject headings:
Underwater archaeology--Great Britain--Congresses.
Underwater archaeology--Scandinavia--Congresses.