Columbia subject headings:
Catholic Church--Relations--Lutheran Church.
Lutheran Church--Relations--Catholic Church.
Vatican Council (2nd : 1962-1965 : Basilica di San Pietro in Vaticano)
Harvard subject headings:
Catholic Church--Relations--Lutheran Church.
Lutheran Church--Relations--Catholic Church
Vatican Council (2nd : 1962-1965 : Basilica di San Pietro in Vaticano)
Princeton subject headings: