Columbia subject headings:
Merchant marine--Soviet Union.
Sea-power--Soviet Union.
Soviet Union. Voenno-Morskoĭ Flot.
Harvard subject headings:
Merchant marine--Soviet Union
Sea-power.
Soviet Union. Voenno-Morskoĭ Flot.
Princeton subject headings:
Merchant marine--Soviet Union.
Sea-power--Soviet Union.
Soviet Union. Voenno-Morskoĭ Flot