Columbia subject headings:
Harvard subject headings:
Alluvial plains--Great Britain--Congresses.
Alluvium--Great Britain--Congresses.
Great Britain--Antiquities.
Water-saturated sites (Archaeology)--Great Britain--Congresses.
Princeton subject headings:
Alluvial plains--Great Britain--Congresses.
Excavations (Archaeology)--Great Britain--Congresses.
Great Britain--Antiquities--Congresses.