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