Columbia subject headings:
Harvard subject headings:
Academic theses
Castles--Conservation and restoration--Germany--History--20th century.
Castles--Germany--History--20th century.
Fortification--Germany--History--20th century.
National socialism and architecture
Princeton subject headings:
Castles--Conservation and restoration--Germany--History--20th century.
Castles--Germany--History--20th century.
Fortification--Germany--History--20th century.
National socialism and architecture--Germany--History--20th century.