Columbia subject headings:
Urbanization--Europe, Northern.
Urbanization--North Sea.
Harvard subject headings:
City planning--North Sea Region.
Coastal zone management--North Sea Region.
Economic development--North Sea Region.
Port cities--North Sea Region.
Regional planning--North Sea Region.
Urbanization--North Sea Region.
Princeton subject headings:
Urbanization--Europe, Northern.
Urbanization--North Sea.