Columbia subject headings:
Catholic Church--History--19th century.
Catholic Church--History--20th century.
Church historians--History.
Church history--Censorship--History.
Church history--Historiography.
Liberalism (Religion)--Catholic Church--History.
Harvard subject headings:
Catholic Church--History--19th century.
Catholic Church--History--20th century.
Church historians--History.
Church history--Censorship--History.
Church history--Historiography--History.
Liberalism (Religion)--Catholic Church--History.
Princeton subject headings: