Columbia subject headings:
Customs administration--Great Britain--History--18th century.
Customs administration--Great Britain--History--19th century.
Smuggling--Great Britain--History--18th century.
Smuggling--Great Britain--History--19th century.
Harvard subject headings:
Customs administration--Great Britain--History--18th century.
Customs administration--Great Britain--History--19th century.
Smuggling--Great Britain--History--18th century.
Smuggling--Great Britain--History--19th century.
Princeton subject headings:
Customs administration--Great Britain--History--18th century.
Customs administration--Great Britain--History--19th century.
Smuggling--Great Britain--History--18th century.
Smuggling--Great Britain--History--19th century.