Columbia subject headings:
Authors, Italian--20th century--Correspondence.
Harvard subject headings:
Authors, Italian--20th century--Correspondence
Cecchi, Emilio, 1884-1966--Correspondence.
Onofri, Arturo, 1885-1928--Correspondence.
Papini, Giovanni, 1881-1956--Correspondence.
Princeton subject headings:
Authors, Italian--20th century--Correspondence.