Columbia subject headings:
Architecture--Germany--Regensburg--History--20th century--Congresses.
Art--Germany--Regensburg--History--Congresses.
City planning--Germany--Regensburg--History--20th century--Congresses.
Regensburg (Germany)--Buildings, structures, etc.
Regensburg (Germany)--History--20th century--Congresses.
Harvard subject headings:
Princeton subject headings:
Architecture--Germany--Regensburg--History--Congresses.
Art--Germany--Regensburg--History--Congresses.
City planning--Germany--Regensburg--History--20th century--Congresses.
Regensburg (Germany)--History--Congresses.