Columbia subject headings:
Authors, Italian--20th century--Correspondence.
Levi, Carlo, 1902-1975--Correspondence.
Harvard subject headings:
Authors, Italian--20th century--Correspondence
Levi, Carlo, 1902-1975--Correspondence.
Princeton subject headings:
Authors, Italian--20th century--Correspondence.
Levi, Carlo, 1902-1975--Correspondence.