Columbia subject headings:
Harvard subject headings:
Castles in literature--Congresses.
Castles--Social aspects--Congresses.
German literature--Middle High German, 1050-1500--History and criticism--Congresses
Literature, Medieval--History and criticism--Congresses
Princeton subject headings:
Castles in literature--Congresses.
Castles--Social aspects--Congresses.
German literature--Middle High German, 1050-1500--History and criticism--Congresses.
Literature, Medieval--History and criticism--Congresses.