Columbia subject headings:
Composers--Germany--Correspondence.
Conductors (Music)--Germany--Correspondence.
Strauss, Richard, 1864-1949--Correspondence.
Harvard subject headings:
Composers--Germany--Correspondence
Conductors (Music)--Germany--Correspondence.
Strauss, Richard, 1864-1949--Correspondence.
Princeton subject headings:
Composers--Correspondence.
Conductors (Music)--Correspondence.
Strauss, Richard, 1864-1949--Correspondence.