Columbia subject headings:
Catholic Church--Ireland--Liturgy--History.
Catholic Church--Liturgy.
Catholic Church. Antiphonary (Bangor)
Ireland--Church history--To 1172.
Harvard subject headings:
Bangor Abbey (Northern Ireland)
Catholic Church--Ireland--Liturgy--History
Catholic Church--Ireland--Liturgy.
Catholic Church--Northern Ireland--Liturgy.
Catholic Church. Antiphonary (Bangor Abbey, Northern Ireland)
Ireland--Church history--To 1172.
Princeton subject headings:
Antiphonaries.
Catholic Church--Ireland--Bangor--Liturgy.