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