Columbia subject headings:
Anglican orders.
Harvard subject headings:
Anglican Communion--Relations--Catholic Church
Anglican orders.
Catholic Church--Relations--Anglican Communion.
Catholic Church. Pope (1878-1903 : Leo XIII). Apostolicae curae.
Ordination--Anglican Communion--History of doctrines--19th century.
Ordination--Catholic Church--History of doctrines--19th century.
Princeton subject headings:
Anglican orders.
Clergy--Office.
Ordination--Anglican Communion.
Ordination--Catholic Church.