Columbia subject headings:
Composers--Germany--Correspondence.
Composers--Germany--Diaries.
Music--20th century--History and criticism.
Zimmermann, Bernd Alois, 1918-1970--Archives.
Zimmermann, Bernd Alois, 1918-1970--Correspondence.
Zimmermann, Bernd Alois, 1918-1970--Diaries.
Harvard subject headings:
Music--History and criticism
Zimmermann, Bernd Alois, 1918-1970.
Princeton subject headings:
Zimmermann, Bernd Alois, 1918-1970.