Columbia subject headings:
Harvard subject headings:
Archaeology, Medieval--Germany--Schleswig-Holstein--Congresses.
Carolingians--History--To 1500--Sources--Congresses.
Saxons--History--To 1500--Sources--Congresses.
Schleswig-Holstein (Germany)--Antiquities--Congresses.
Schleswig-Holstein (Germany)--Boundaries--History--Sources--Congresses.
Schleswig-Holstein (Germany)--History--Errors, inventions, etc.--Congresses.
Slavic countries--Boundaries--Germany--History--Sources--Congresses.
Princeton subject headings:
Archaeology, Medieval--Germany--Schleswig-Holstein--Congresses.
Carolingians--History--To 1500--Sources--Congresses.
Saxons--History--To 1500--Sources--Congresses.
Schleswig-Holstein (Germany)--Antiquities--Congresses.
Schleswig-Holstein (Germany)--Boundaries--History--Sources--Congresses.
Schleswig-Holstein (Germany)--History--Errors, inventions, etc.--Congresses.
Slavic countries--Boundaries--Germany--History--Sources--Congresses.