Columbia subject headings:
Allgäu (Germany)--History, Local.
Castles--Germany--Allgäu--History.
Harvard subject headings:
Allgäu (Germany)--History, Local.
Castles--Germany--Allgäu--History.
Princeton subject headings:
Allgäu (Germany)--History, Local.
Castles--Germany (West)--Allgäu--History.