Columbia subject headings:
Harvard subject headings:
Art, Medieval--Germany--Harz Mountains Region--Congresses.
Harz Mountains Region (Germany)--Church history--Congresses.
Harz Mountains Region (Germany)--History--Congresses.
Princeton subject headings:
Art, Medieval--Germany--Harz Mountains Region--Congresses.
Christian art and symbolism--Germany--Harz Mountains Region--Medieval, 500-1500--Congresses.
Harz Mountains (Germany)--History--Congresses.