Columbia subject headings:
Composers--Correspondence.
Gerhard, Roberto, 1896-1970--Correspondence.
Schoenberg, Arnold, 1874-1951--Correspondence.
Harvard subject headings:
Composers--Correspondence
Gerhard, Roberto, 1896-1970--Correspondence.
Schoenberg, Arnold, 1874-1951--Correspondence.
Princeton subject headings:
Composers--Correspondence.
Gerhard, Roberto, 1896-1970--Correspondence.
Personal correspondence.
Schoenberg, Arnold, 1874-1951--Correspondence.