Columbia subject headings:
Harvard subject headings:
Architecture--Mutilation, defacement, etc.--Denmark--History.
Architecture--Mutilation, defacement, etc.--Germany--History.
Denmark--Boundaries--Germany.
Germany--Boundaries--Denmark.
Monuments--Denmark--History.
Monuments--Germany--History.
Sculpture--Mutilation, defacement, etc.--Denmark--History.
Sculpture--Mutilation, defacement, etc.--Germany--History.
Princeton subject headings:
Borderlands--Denmark.
Borderlands--Germany.
Denmark--Relations--Germany.
Germany--Relations--Denmark.
War memorials--Germany.