Columbia subject headings:
Harvard subject headings:
Convents--Germany--Essen--History--Congresses.
Essen (Germany)--Intellectual life--Congresses.
Essen (Germany)--Social conditions--Congresses.
Stift Essen--History--Congresses.
Princeton subject headings:
Altarpieces, Gothic--Germany--Congresses.
Altarpieces, Medieval--Germany--Congresses.
Christian art and symbolism--Germany--Medieval, 500-1500--Congresses.
Panel painting, Gothic--Germany--Congresses.