Columbia subject headings:
Orthodox Eastern Church--Relations--Protestant churches.
Protestant churches--Relations--Orthodox Eastern Church.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--History.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Relations--Protestant churches.
Harvard subject headings:
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Relations--Protestantism.
Princeton subject headings: