Columbia subject headings:
Harvard subject headings:
Catholic Church--Relations--Orthodox Eastern Church.
Orthodox Eastern Church--Relations--Catholic Church.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Catechisms--English.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Government.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Liturgy.
Princeton subject headings:
Catholic Church--Relations--Orthodox Eastern Church.
Orthodox Eastern Church--Relations--Catholic Church.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Catechisms and creeds--English.
Russkai︠a︡ pravoslavnai︠a︡ t︠s︡erkovʹ--Government.