Columbia subject headings:
Luther, Martin, 1483-1546--Congresses.
Melanchthon, Philip, 1497-1560--Congresses.
Harvard subject headings:
Luther, Martin, 1483-1546--Congresses.
Melanchthon, Philip, 1497-1560
Melanchthon, Philip, 1497-1560--Congresses.
Princeton subject headings:
Luther, Martin, 1483-1546--Congresses.
Melanchthon, Philip, 1497-1560--Congresses.