Columbia subject headings:
Catholic Church--Europe--History--19th century--Congresses.
Church history--19th century--Congresses.
Liberalism (Religion)--Europe--Catholic Church--History--Congresses.
Harvard subject headings:
Catholic Church--Europe--History--19th century--Congresses.
Christianity--Congresses
Church history--19th century--Congresses.
Liberalism (Religion)--Catholic Church--History--Congresses.
Princeton subject headings:
Catholic Church--France--History--19th century--Congresses.
Catholic Church--Italy--History--19th century--Congresses.
Catholic Church--Spain--History--19th century--Congresses.
France--Church history--19th century--Congresses.
Italy--Church history--19th century--Congresses.
Liberalism (Religion)--Catholic Church--History--19th century--Congresses.
Liberalism (Religion)--France--History--19th century--Congresses.
Liberalism (Religion)--Italy--History--19th century--Congresses.
Liberalism (Religion)--Spain--History--19th century--Congresses.
Spain--Church history--19th century--Congresses.