Columbia subject headings:
Harvard subject headings:
Congress of Vienna (1814-1815)
Consalvi, Ercole, 1757-1824.
Papal States--History--1815-1870--Sources.
Princeton subject headings:
Congress of Vienna (1814-1815)
Consalvi, Ercole, 1757-1824.
Papal States--History--1815-1870--Sources.