Columbia subject headings:
Authors--Societies, etc.--Exhibitions.
Literature, Modern--20th century--Exhibitions.
PEN (Organization)--History--Exhibitions.
Harvard subject headings:
Authors--Societies, etc.--History--Exhibitions.
Literature and society--Germany--History--Exhibitions.
PEN (Organization)--History--Exhibitions.
Princeton subject headings:
Authors--Societies, etc.--Exhibitions.
Literature, Modern--20th century--Exhibitions.
PEN (Organization)--History--Exhibitions.