Columbia subject headings:
Harvard subject headings:
Catholic Church--Italy--History--19th century.
Catholic Church--Italy--History--20th century.
Catholic Church--Italy--Political activity.
Italy--Church history--19th century.
Italy--Church history--20th century.
Roman question.
Princeton subject headings:
Catholic Church--Italy--History--19th century.
Catholic Church--Italy--History--20th century.
Catholic Church--Italy--Political activity.
Italy--Church history--19th century.
Italy--Church history--20th century.
Roman question.