Columbia subject headings:
Harvard subject headings:
Calogero, Guido, 1904---Correspondence.
Capitini, Aldo--Correspondence.
Philosophers--Italy--Correspondence
Princeton subject headings:
Calogero, Guido, 1904---Correspondence.
Capitini, Aldo--Correspondence.
Italy--Intellectual life--20th century.
Philosophers--Italy--Correspondence.