Columbia subject headings:
Harvard subject headings:
Catholic Church--Diplomatic service--History--Congresses.
Catholic Church. Curia Romana--History--Congresses.
Church management--History--Congresses.
Codicology--History--Congresses.
Letters, Papal--History--Congresses.
Princeton subject headings:
Catholic Church--Diplomatic service--History--Congresses.
Catholic Church. Curia Romana--History--Congresses.
Church management--History--Congresses.
Codicology--History--Congresses.
Letters, Papal--History--Congresses.