Columbia subject headings:
Harvard subject headings:
Cerroni, Mario, 1921-1957--Correspondence.
De Libero, Libero--Correspondence.
Poets, Italian--20th century--Correspondence.
Princeton subject headings:
Cerroni, Mario, 1921---Correspondence.
De Libero, Libero--Correspondence.
Poets, Italian--20th century--Correspondence.