Columbia subject headings:
Concrete art--Exhibitions.
Prints, Swiss--Exhibitions.
Prints--Switzerland--20th century--Exhibitions.
Prints--Texas--Exhibitions.
Harvard subject headings:
Concrete art--Exhibitions.
Prints, Swiss--20th century--Exhibitions.
Prints, Swiss--Exhibitions.
Prints--20th century--Switzerland--Exhibitions.
Prints--Texas--Exhibitions.
Princeton subject headings:
Concrete art--Exhibitions.
Prints, Swiss--Exhibitions.
Prints--20th century--Exhibitions.
Prints--Texas--Exhibitions.