Columbia subject headings:
London (England)--Commerce--History--15th century--Sources.
London (England)--Economic conditions--15th century--Sources.
Harvard subject headings:
International trade--Accounting--History--Sources.
London (England)--Commerce--History--15th century--Sources.
London (England)--Economic conditions--15th century--Sources.
Tariff--England--History--Sources.
Princeton subject headings:
International trade--Accounting--History--Sources.
London (England)--Commerce--History--15th century--Sources.
London (England)--Economic conditions--15th century--Sources.
Tariff--England--History--Sources.