Columbia subject headings:
Harvard subject headings:
Catholic Church--Doctrines--History--19th century.
Christian sociology--Catholic Church--History of doctrines--19th century.
Church--History of doctrines--19th century.
Episcopacy--History of doctrines--19th century.
Ketteler, Wilhelm Emmanuel, Freiherr von, 1811-1877.
Popes--Infallibility--History of doctrines--19th century.
Vatican Council (1st : 1869-1870 : Basilica di San Pietro in Vaticano)
Princeton subject headings:
Ketteler, Wilhelm Emmanuel, Freiherr von, 1811-1877.