Columbia subject headings:
Harvard subject headings:
Hauptmann, Carl, 1858-1921--Criticism and interpretation--Congresses.
Hauptmann, Gerhart, 1862-1946--Criticism and interpretation--Congresses.
Princeton subject headings:
Authors, German--20th century--Congresses.
Hauptmann, Carl, 1858-1921--Criticism and interpretation--Congresses.
Hauptmann, Gerhart, 1862-1946--Criticism and interpretation--Congresses.