Columbia subject headings:
Harvard subject headings:
Architects--Belgium.
Architecture, Modern--19th century--Belgium.
Architecture, Modern--20th century--Belgium.
Art nouveau (Architecture)--Belgium.
Horta, Victor, baron, 1861-1947
Horta, Victor, baron, 1861-1947--Criticism and interpretation.
Princeton subject headings:
Architecture, Modern--19th century--Belgium--Brussels.
Architecture, Modern--20th century--Belgium--Brussels.
Art nouveau (Architecture)--Belgium--Brussels.
Brussels (Belgium)--Buildings, structures, etc.
Horta, Victor, baron, 1861-1947.