Columbia subject headings:
Betti, Paolo, 1894-1972--Correspondence--History and criticism.
Communists--Italy--Correspondence--History and criticism.
Giaccaglia, Lea, 1897---Correspondence--History and criticism.
Italy--History--1922-1945.
Harvard subject headings:
Betti, Paolo, 1894-1972--Correspondence--History and criticism.
Betti, Paolo--Correspondence.
Communists--Italy--Correspondence--History and criticism.
Giaccaglia, Lea, 1897---Correspondence--History and criticism.
Giaccaglia, Lea--Correspondence.
Italy--History--1922-1945.
Princeton subject headings:
Betti, Paolo, 1894-1974--Correspondence.
Giaccaglia, Lea, 1897---Correspondence.
Italy--History--1922-1945.