Columbia subject headings:
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History.
Harvard subject headings:
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History.
Soviet Union--Church history.
Princeton subject headings:
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History.
Soviet Union--Church history.