Columbia subject headings:
Soviet Union. Voenno-Morskoĭ Flot. Chernomorskiĭ flot--Submarine forces--History.
World War, 1939-1945--Baltic Sea.
World War, 1939-1945--Naval operations, Soviet.
World War, 1939-1945--Naval operations--Submarine.
Harvard subject headings:
Soviet Union. Voenno-Morskoĭ Flot. Chernomorskiĭ flot--Submarine forces--History.
World War, 1939-1945--Baltic Sea.
World War, 1939-1945--Naval operations, Soviet.
World War, 1939-1945--Naval operations--Submarine.
Princeton subject headings:
World War, 1939-1945--Baltic Sea.
World War, 1939-1945--Naval operations, Soviet.
World War, 1939-1945--Naval operations--Submarine.