Columbia subject headings:
Harvard subject headings:
Ferries--Turkey--Bosporus--History.
Merchant marine--Turkey--History--20th century.
Shipping--Turkey--History--20th century.
Ships--Turkey--History--20th century.
Wharves--Turkey--History--20th century.
Princeton subject headings:
Merchant marine--Turkey--20th century--History.
Shipping--Turkey--20th century--History.
Ships--Turkey--20th century--History.
Wharves--Turkey--20th century--History.