Columbia subject headings:
Cathedrals--Conservation and restoration--Germany--Trier--History--18th century.
Trier (Germany)--Buildings, structures, etc.
Harvard subject headings:
Cathedrals--Conservation and restoration--Germany--Trier--History--18th century.
Trier (Germany)--Buildings, structures, etc.
Princeton subject headings:
Cathedrals--Conservation and restoration--Germany--Trier--History--18th century.
Trier (Germany)--Buildings, structures, etc.