Columbia subject headings:
Architecture--Belgium--Guidebooks.
Architecture--Belgium--History--20th century--Guidebooks.
Harvard subject headings:
Architecture, Modern--20th century--Belgium--Guidebooks.
Architecture--Belgium--Guidebooks.
Architecture--Belgium--History--Guidebooks.
Belgium--Description and travel--Guidebooks.
Princeton subject headings:
Architecture, Modern--20th century--Belgium--Guidebooks.
Architecture--Belgium--Guidebooks.