Columbia subject headings:
Harvard subject headings:
Bonfanti, Arturo, 1905-1978.
Concrete art--Exhibitions.
Vordemberge-Gildewart, Friedrich, 1899-1962.
Wittner, Gerhard, 1926-
Princeton subject headings:
Bonfanti, Arturo, 1905-1978.
Concrete art--Exhibitions.
Vordemberge-Gildewart, Friedrich, 1899-1962.
Wittner, Gerhard, 1926-