Columbia subject headings:
Art, Abstract--Austria--Exhibitions.
Art, Abstract--Europe--Exhibitions.
Art, Abstract--Germany--Exhibitions.
Art, Abstract--Italy--Exhibitions.
Art, Austrian--20th century--Exhibitions.
Art, German--20th century--Exhibitions.
Art, Italian--Exhibitions.
Harvard subject headings:
Art, Abstract--Austria--Exhibitions.
Art, Abstract--Germany--Exhibitions
Art, Abstract--Italy--Exhibitions
Art, Austrian--20th century--Exhibitions.
Art, German--20th century--Exhibitions.
Art, Italian--20th century--Exhibitions
Art, Modern--20th century--Austria--Exhibitions.
Art, Modern--20th century--Germany--Exhibitions.
Art, Modern--20th century--Italy--Exhibitions.
Princeton subject headings:
Art, Abstract--Europe--Exhibitions.
Art, European--20th century--Exhibitions.
Art, European--Exhibitions.