Columbia subject headings:
Harvard subject headings:
Customs administration--England--Portsmouth--History--Sources.
Harbors--Port charges--History--Sources.
Portsmouth (England)--History--Sources.
Tariff--England--Portsmouth--History--Sources.
Princeton subject headings:
Customs administration--England--Portsmouth--History--18th century--Sources.
Harbors--Port charges--History--Sources.
Portsmouth (England)--History--Sources.
Tariff--England--Portsmouth--History--18th century--Sources.