Columbia subject headings:
Coasts--Belgium--Congresses.
Coasts--Netherlands--Congresses.
Land settlement--Belgium--History--Congresses.
Land settlement--Netherlands--History--Congresses.
Harvard subject headings:
Coasts--Belgium--Congresses.
Coasts--Netherlands--Congresses.
Land settlement--Belgium--History--Congresses.
Land settlement--Netherlands--History--Congresses.
Princeton subject headings: