Columbia subject headings:
Composers--Italy--Correspondence.
Verdi, Giuseppe, 1813-1901--Correspondence.
Verdi, Giuseppe, 1813-1901--Political and social views.
Harvard subject headings:
Composers--Italy--Correspondence
Verdi, Giuseppe, 1813-1901--Political and social views.
Verdi, Giuseppe, 1813-1901. Correspondence.
Princeton subject headings: