Columbia subject headings:
Arx, Cäsar von, 1895-1949--Correspondence.
Authors, Swiss--Correspondence.
College teachers--Correspondence.
Oberholzer, Otto, 1919---Correspondence.
Harvard subject headings:
Arx, Cäsar von, 1895-1949--Correspondence.
Authors, Swiss--20th century--Correspondence
College teachers--Correspondence.
Dramatists, Swiss--20th century--Correspondence.
Oberholzer, Otto, 1919---Correspondence.
Princeton subject headings: