Columbia subject headings:
Art, European--20th century--Exhibitions.
Painting, European--20th century--Exhibitions.
Planque, Jean--Art collections--Exhibitions.
Harvard subject headings:
Art--Private collections--Switzerland.
Painting, European--20th century--Catalogs.
Painting, Modern--20th century--Catalogs
Planque, Jean--Art collections--Catalogs.
Princeton subject headings:
Art, European--20th century--Exhibitions.
Painting, European--20th century--Exhibitions.
Planque, Jean--Art collections--Exhibitions.