Columbia subject headings:
Russia. Okhrannyi︠a︡ otdi︠e︡lenīi︠a︡--Bibliography.
Soviet Union. Okhrannyi͡a otdi͡elenīi͡a--Bibliography.
Harvard subject headings:
Intelligence service--Soviet Union.
Russia. Okhrannyi︠a︡ otdi︠e︡lenīi︠a︡--Bibliography.
Princeton subject headings:
Russia. Okhrannyi︠a︡ otdi︠e︡lenīi︠a︡--Bibliography.