Columbia subject headings:
Cargo ships--England--Passenger traffic.
Cargo ships--Ireland--Passenger traffic.
Dee, River, Estuary (England)--History.
Parkgate (Cheshire West and Cheshire, England)--History.
Transportation--England--History--18th century.
Transportation--Ireland--History--18th century.
Harvard subject headings:
Navigation--England--Parkgate--History.
Princeton subject headings:
Navigation--England--Parkgate--History.