Columbia subject headings:
Art, Modern--20th century--Congresses.
Art, Modern--21st century--Congresses.
Artists--Biography--Congresses.
Expressionism (Art)--Congresses.
Portraits--Congresses.
Harvard subject headings:
Art, Modern--20th century--Congresses
Art, Modern--21st century--Congresses.
Artists--Biography--Congresses.
Expressionism (Art)--Congresses.
Portraits--Congresses.
Princeton subject headings:
Art, Modern--20th century--Congresses.
Art, Modern--21st century--Congresses.
Artists--Biography--Congresses.
Expressionism (Art)--Congresses.
Portraits--Congresses.