Columbia subject headings:
Architecture, Medieval--Conservation and restoration--Germany--History--19th century.
Architecture--Conservation and restoration--Germany--History--19th century.
Cathedrals--Conservation and restoration--Germany--History--19th century.
Harvard subject headings:
Architecture, Medieval--Conservation and restoration--Germany--History--19th century.
Architecture--Conservation and restoration--Germany--History--19th century.
Cathedrals--Conservation and restoration--Germany--History--19th century.
Princeton subject headings:
Architecture, Medieval--Germany--Conservation and restoration--History--19th century.
Architecture--Germany--Conservation and restoration--History--19th century.
Cathedrals--Germany--Conservation and restoration--History--19th century.