Columbia subject headings:
Docks--England--Liverpool.
Harbors--England--Liverpool.
Harvard subject headings:
Docks--England--Liverpool--Conservation and restoration.
Docks--England--Liverpool.
Liverpool (England)--Buildings, structures, etc.
Waterfronts--England--Liverpool.
Princeton subject headings:
Docks--England--Liverpool.
Harbors--England--Liverpool.
Waterfronts--England--Liverpool.