Columbia subject headings:
Cities and towns--Germany--Regensburg--History--Congresses.
Public spaces--Germany--Regensburg--History--Congresses.
Regensburg (Germany)--History--Congresses.
Harvard subject headings:
Princeton subject headings:
Cities and towns--Germany--Regensburg--History--Congresses.
Public spaces--Germany--Regensburg--History--Congresses.
Regensburg (Germany)--History--Congresses.