Columbia subject headings:
Folklore--Germany, Northern--Congresses.
Germany, Northern--Historiography--Congresses.
Germany, Northern--History--Congresses.
Harvard subject headings:
Folklore--Germany, Northern--Congresses.
Germany, Northern--Historiography--Congresses.
Germany, Northern--History--Congresses.
Princeton subject headings:
Folklore--Germany, Northern--Congresses.
Folklore--Germany--Schleswig-Holstein--Congresses.
Germany, Northern--History--Congresses.
Schleswig-Holstein (Germany)--History--Congresses.