Columbia subject headings:
Concrete poetry--Exhibitions.
Nationalgalerie (Germany : West)--Exhibitions.
Visual poetry--Exhibitions.
Harvard subject headings:
Concrete poetry--Catalogs.
Concrete poetry--Germany--Berlin--Catalogs.
Nationalgalerie (Germany : West)--Catalogs.
Words in art--Catalogs.
Words in art--Germany--Berlin--Catalogs.
Princeton subject headings: