Columbia subject headings:
Harvard subject headings:
Merchant marine--Greece--History--20th century.
Merchant ships--Greece--History--20th century.
World War, 1939-1945--Naval operations, Greek.
Princeton subject headings:
Merchant marine--Greece--History--20th century.
Merchant ships--Greece--History--20th century.
World War, 1939-1945--Naval operations, Greek.