Columbia subject headings:
Authors, Italian--20th century--Correspondence.
De Robertis, Giuseppe, 1888-1963--Correspondence.
Ungaretti, Giuseppe, 1888-1970--Correspondence.
Harvard subject headings:
Authors, Italian--20th century--Correspondence
De Robertis, Giuseppe, 1888-1963--Correspondence.
Ungaretti, Giuseppe, 1888-1970--Correspondence.
Princeton subject headings:
Authors, Italian--20th century--Correspondence.
De Robertis, Giuseppe, 1888-1963--Correspondence.
Ungaretti, Giuseppe, 1888-1970--Correspondence.