Columbia subject headings:
Harvard subject headings:
Bergamo (Italy)--Church history--Congresses.
Bergamo (Italy)--Economic conditions--Congresses.
Brescia (Italy)--Church history--Congresses.
Brescia (Italy)--Economic conditions--Congresses.
Catholic Church--Italy--Bergamo--History--19th century--Congresses.
Catholic Church--Italy--Brescia--History--19th century--Congresses.
Princeton subject headings:
Pius IX, Pope, 1792-1878.