Columbia subject headings:
Harvard subject headings:
Bismarck, Otto, fürst von, 1815-1898.
History--Philosophy
Luther, Martin, 1483-1546
Treitschke, Heinrich von, 1834-1896.
Treitschke, Karl Gotthard, 1856-1915.
Princeton subject headings:
History--Philosophy.
Treitschke, Karl Gotthard, 1856-1915.