Columbia subject headings:
Baptisteries--Congresses.
Liturgy and architecture--Congresses.
Harvard subject headings:
Baptisteries--Europe--Congresses.
Baptisteries--Middle East--Congresses.
Liturgy and architecture--Congresses.
Princeton subject headings:
Baptisteries--Europe--Congresses.
Baptisteries--Middle East--Congresses.
Liturgy and architecture--Congresses.