Columbia subject headings:
Baltic Sea--History.
Soviet Union--History, Naval.
Soviet Union. Voenno-Morskoĭ Flot. Baltiĭskiĭ flot--History.
Harvard subject headings:
Princeton subject headings:
Baltic Sea--History.
Soviet Union--History, Naval.
Soviet Union. Voenno-Morskoĭ Flot. Baltiĭskiĭ flot--History.