Columbia subject headings:
Clergy--Office--History of doctrines--Congresses.
Justification (Christian theology)--History of doctrines--Congresses.
Pastoral theology and Christian union--Congresses.
Sacraments and Christian union--Congresses.
Sacraments--History of doctrines--Congresses.
Harvard subject headings:
Catholic Church--Relations--Protestant churches.
Counter-Reformation.
Excommunication.
Protestant churches--Relations--Catholic Church
Reformation.
Theology, Doctrinal.
Princeton subject headings:
Catholic Church--Relations--Protestant churches.
Protestant churches--Relations--Catholic Church.
Theology, Doctrinal.