Columbia subject headings:
Altarpieces, Medieval--Europe.
Altars, Medieval--Europe.
Harvard subject headings:
Altarpieces, Medieval--Europe--Congresses.
Altars, Medieval--Europe--Congresses.
Liturgy and art--Europe--Congresses.
Princeton subject headings:
Altarpieces, Medieval--Europe--Congresses.
Altars, Medieval--Europe--Congresses.