Columbia subject headings:
Composers--Germany--Correspondence.
Webern, Anton, 1883-1945--Correspondence.
Webern, Anton, 1883-1945--Criticism and interpretation.
Harvard subject headings:
Composers--Germany--Correspondence
Webern, Anton, 1883-1945--Correspondence.
Webern, Anton, 1883-1945--Criticism and interpretation.
Webern, Anton, 1883-1945.
Princeton subject headings:
Webern, Anton, 1883-1945.