Columbia subject headings:
Harvard subject headings:
Harbors--England--Liverpool--History.
Liverpool (England)--Economic conditions.
Liverpool (England)--History.
Mersey Docks and Harbour Company--History.
Princeton subject headings:
Harbors--England--Liverpool--History.
Liverpool (England)--Economic conditions.
Liverpool (England)--History.
Mersey Docks and Harbour Company--History.