Columbia subject headings:
Luther, Martin, 1483-1546--Anniversaries, etc.--Congresses.
Harvard subject headings:
Catholic Church--Relations--Lutheran Church.
Luther, Martin, 1483-1546--Anniversaries, etc., 1983--Congresses.
Lutheran Church--Relations--Catholic Church
Princeton subject headings:
Luther, Martin, 1483-1546--Anniversaries, etc., 1983--Congresses.