Columbia subject headings:
Harvard subject headings:
Composers--Italy--Correspondence
Mezzo-sopranos--Austria--Correspondence.
Verdi, Giuseppe, 1813-1901. Correspondence.
Waldmann, Maria, 1944-1920--Correspondence.
Princeton subject headings:
Composers--Italy--Correspondence.
Mezzo-sopranos--Austria--Correspondence.
Verdi, Giuseppe, 1813-1901. Correspondence.
Waldmann, Maria, 1944-1920--Correspondence.