Columbia subject headings:
Liturgical language--Church Slavic.
Liturgical language--Russian.
Olga, Grand Duchess of Kyïv, Saint, approximately 890-969--Prayers and devotions.
Orthodox Eastern Church--Liturgy.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Liturgy.
Harvard subject headings:
Liturgics--Russia.
Olga, Grand Duchess of Kyïv, Saint, approximately 890-969
Princeton subject headings:
Liturgics--Russia.
Olga, Grand Duchess of Kyïv, Saint, approximately 890-969.