Columbia subject headings:
Composers--Italy--Correspondence.
Music publishers--Italy--Correspondence.
Ricordi, Giulio, 1840-1912--Correspondence.
Verdi, Giuseppe, 1813-1901--Correspondence.
Harvard subject headings:
Princeton subject headings:
Ricordi, Giulio, 1840-1912--Correspondence.
Verdi, Giuseppe, 1813-1901. Correspondence.