Columbia subject headings:
Harvard subject headings:
Catholic Church. Synodus Episcoporum--History.
Conciliar theory--History of doctrines--Congresses.
Councils and synods--History--Congresses.
Princeton subject headings:
Catholic Church. Synodus Episcoporum--History.
Conciliar theory--History of doctrines--Congresses.
Councils and synods--History--Congresses.