Columbia subject headings:
Harvard subject headings:
Critics--Italy--Correspondence
De Sanctis, Francesco, 1817-1883--Correspondence.
Guicciardini, Francesco, 1483-1540--Knowledge--History.
Intellectuals--Italy--Correspondence.
Italy--History--1492-1559.
Leopardi, Giacomo, 1798-1837--Criticism and interpretation.
Princeton subject headings:
De Sanctis, Francesco, 1817-1883.