Columbia subject headings:
Harvard subject headings:
Hauptmann, Gerhart, 1862-1946--Correspondence.
Hauptmann, Margarete--Correspondence.
Loerke, Oskar, 1884-1941--Correspondence.
Princeton subject headings:
Hauptmann, Gerhart, 1862-1946--Correspondence.
Hauptmann, Margarete--Correspondence.
Loerke, Oskar, 1884-1941--Correspondence.
Personal correspondence.