Columbia subject headings:
Harvard subject headings:
Merchant marine--Poland--History--20th century.
World War, 1939-1945--Naval operations, Polish.
World War, 1939-1945--Personal narratives, Polish.
World War, 1939-1945--Prisoners and prisons, German.
Princeton subject headings:
Merchant marine--Poland--History--20th century.
World War, 1939-1945--Naval operations, Polish.
World War, 1939-1945--Personal narratives, Polish.
World War, 1939-1945--Prisoners and prisons, German.