Columbia subject headings:
Harvard subject headings:
Russians--Europe--Religion.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ zagranit︠s︡eĭ--Anniversaries, etc.
Princeton subject headings:
Millennium of Christianity in Kievan Rus, 988-1988.
Orthodox Eastern Church--History.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ zagranit︠s︡eĭ--History.