Columbia subject headings:
Harvard subject headings:
Naval convoys--North Atlantic Ocean--History--Sources.
World War, 1939-1945--Russia, Northern--History--Sources.
World War, 1939-1945--Transportation--History--Sources.
Princeton subject headings:
Merchant marine--Soviet Union--History.
Naval convoys--History--20th century.
Russia, Northern--History, Naval.
World War, 1939-1945--Naval operations.
World War, 1939-1945--Russia, Northern.
World War, 1939-1945--Transportation.