Columbia subject headings:
Catholic Church--Relations--Eastern churches--Congresses.
Catholic Church--Relations--Protestant churches--Congresses.
Council of Constantinople (1st : 381 : Constantinople)--Congresses.
Eastern churches--Relations--Catholic Church--Congresses.
Eastern churches--Relations--Protestant churches--Congresses.
Nicene Creed--Congresses.
Protestant churches--Relations--Catholic Church--Congresses.
Protestant churches--Relations--Eastern churches--Congresses.
Harvard subject headings:
Catholic Church--Relations--Eastern churches--Congresses.
Catholic Church--Relations--Protestant churches--Congresses.
Council of Constantinople (1st : 381 : Constantinople)--Congresses.
Eastern churches--Relations--Catholic Church--Congresses.
Eastern churches--Relations--Protestant churches--Congresses.
Nicene Creed--Congresses.
Protestant churches--Relations--Catholic Church--Congresses.
Protestant churches--Relations--Eastern churches--Congresses.
Princeton subject headings:
Council of Constantinople (1st : 381).
Nicene Creed.