Columbia subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Church history--Modern period, 1500---Congresses.
Counter-Reformation--Congresses.
Liturgics--History--Congresses.
Reformation--Congresses.
Harvard subject headings:
Church history--15th century--Congresses.
Church history--16th century--Congresses.
Reformation--Congresses
Princeton subject headings:
Church history--Middle Ages, 600-1500--Congresses.
Church history--Modern period, 1500---Congresses.
Counter-Reformation--Congresses.
Liturgics--History--Congresses.
Reformation--Congresses.