Columbia subject headings:
City planning--Belgium--Liège--Exhibitions.
Urban policy--Belgium--Liège--Exhibitions.
Urban renewal--Belgium--Liège--Exhibitions.
Harvard subject headings:
Liège (Belgium)--History--19th century--Exhibitions.
Liège (Belgium)--History--20th century--Exhibitions.
Liège (Belgium)--Pictorial works.
Princeton subject headings: