Columbia subject headings:
Harvard subject headings:
Russia (Federation)--Church history
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History--20th century.
Soviet Union--Church history
Princeton subject headings:
Russia (Federation)--Church history--20th century.
Russia--Church history--20th century.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History--20th century.
Soviet Union--Church history.