Columbia subject headings:
Harvard subject headings:
Catholic Church--Clergy--Congresses.
Military religious orders--Germany--History--Congresses.
Teutonic Knights--History--Congresses.
Teutonic Knights--Religious life--Congresses.
Princeton subject headings:
Catholic Church--Clergy.
Military religious orders--Germany--History--Congresses.
Teutonic Knights--History--Congresses.
Teutonic Knights--Religious life--Congresses.