Columbia subject headings:
Burg Varel (Varel, Germany)
Schloss Varel (Varel, Germany)
Varel (Germany)--Buildings, structures, etc.
Harvard subject headings:
Burg Varel (Varel, Germany)
Schloss Varel (Varel, Germany)
Varel (Germany)--Buildings, structures, etc.
Princeton subject headings: