Columbia subject headings:
Harvard subject headings:
Holy Year, 1825.
Leo XII, Pope, 1760-1829.
Princeton subject headings:
Genga (Italy)--Church history--Congresses.
Holy Year, 1825--Congresses.
Holy Year--History--Congresses.
Leo XII, Pope, 1760-1829--Congresses.
Papal States--Politics and government--1815-1870--Congresses.