Columbia subject headings:
Ryman, Robert, 1930-2019--Exhibitions.
Harvard subject headings:
Art--Switzerland--Schaffhausen--Exhibitions.
Hallen für Neue Kunst (Schaffhausen, Switzerland)--Exhibitions.
Raussmüller, Urs--Exhibitions.
Ryman, Robert, 1930-2019--Exhibitions.
Ryman, Robert, 1930-2019--Museums.
Princeton subject headings: