Columbia subject headings:
Concrete art--France.
Hélion, Jean, 1904-1987--Criticism and interpretation.
Harvard subject headings:
Hélion, Jean, 1904-1987--Catalogs.
Musée national d'art moderne (France)--Catalogs.
Princeton subject headings:
Concrete art--France.
Hélion, Jean, 1904-1987--Criticism and interpretation.