Columbia subject headings:
Hauptmann, Gerhart, 1862-1946--Criticism and interpretation--Congresses.
Hauptmann, Gerhart, 1862-1946. Weber--Congresses.
Harvard subject headings:
Hauptmann, Gerhart, 1862-1946--Criticism and interpretation--Congresses.
Hauptmann, Gerhart, 1862-1946. Weber--Congresses.
Princeton subject headings:
Hauptmann, Gerhart, 1862-1946--Criticism and interpretation--Congresses.