Columbia subject headings:
Harvard subject headings:
Cargo ships--Europe, Northern--History.
Customs administration--Estonia--Tallinn--History.
Hanseatic League--Commerce--History.
Tallinn (Estonia)--Commerce--History.
Tonnage--History.
Princeton subject headings:
Hanseatic League--Commerce.
Shipping--Estonia--Tallinn--History.
Ships--History.
Ships--Measurement.