Columbia subject headings:
Ansermet, Ernest, 1883-1969--Correspondence.
Composers--United States--Correspondence.
Conductors (Music)--Switzerland--Correspondence.
Harvard subject headings:
Ansermet, Ernest, 1883-1969--Correspondence.
Composers--United States--Correspondence
Conductors (Music)--Switzerland--Correspondence.
Copland, Aaron, 1900-1990--Correspondence.
Orchestre de la Suisse romande.
Thomson, Virgil, 1896-1989--Correspondence.
Princeton subject headings: