Columbia subject headings:
Historic preservation--Germany--Brandenburg--Congresses.
Historic preservation--Germany--Prussia--Congresses.
Quast, Ferdinand von, 1807-1877--Congresses.
Harvard subject headings:
Architecture--Conservation and restoration--Germany--Congresses.
Historic preservation--Germany--Brandenburg--Congresses.
Historic preservation--Germany--Prussia--Congresses.
Monuments--Conservation and restoration--Germany--Congresses.
Quast, Ferdinand von, 1807-1877--Congresses.
Princeton subject headings: