Columbia subject headings:
Harvard subject headings:
Architecture, Modern--20th century--Germany--Bonn--Guidebooks.
Architecture--Germany--Bonn Region--Guidebooks.
Bonn (Germany)--Buildings, structures, etc.--Guidebooks.
Princeton subject headings:
Architecture, Modern--20th century--Germany (West)--Bonn--Guidebooks.
Architecture--Germany (West)--Bonn Region--Guidebooks.
Bonn (Germany)--Buildings, structures, etc.--Guidebooks.