Columbia subject headings:
Hartung, Hans, 1904-1989--Exhibitions.
Painting, Abstract--Germany--Exhibitions.
Harvard subject headings:
Hartung, Hans, 1904-1989--Exhibitions.
Painting, Abstract--Germany--Exhibitions.
Princeton subject headings:
Hartung, Hans, 1904-1989--Exhibitions.
Painting, Abstract--Germany--Exhibitions.