Columbia subject headings:
Architecture--Germany--Bonn--Guidebooks.
Art--Germany--Bonn--Guidebooks.
Bonn (Germany)--Buildings, structures, etc.--Guidebooks.
Harvard subject headings:
Architecture--Germany--Bonn--Guidebooks.
Art--Germany--Bonn--Guidebooks.
Bonn (Germany)--Buildings, structures, etc.--Guidebooks.
Princeton subject headings:
Architecture--Germany (West)--Bonn--Guidebooks.
Art--Germany (West)--Bonn--Guidebooks.
Bonn (Germany)--Buildings, structures, etc.--Guidebooks.