Columbia subject headings:
Harvard subject headings:
Ferdinand I, King of the Two Sicilies, 1751-1825--Correspondence.
Kingdom of the Two Sicilies--Kings and rulers--Correspondence.
Naples (Kingdom)--History--1735-1816--Sources.
Princeton subject headings:
Ferdinand I, King of the Two Sicilies, 1751-1825--Correspondence.
Kingdom of the Two Sicilies--Kings and rulers--Correspondence.
Naples (Kingdom)--History--1735-1816--Sources.