Columbia subject headings:
Anthroposophy--History--Sources.
Hübbe-Schleiden, Wilhelm, 1846-1916--Archives.
Hübbe-Schleiden, Wilhelm, 1846-1916--Correspondence.
Theosophists--Archives.
Theosophists--Correspondence.
Theosophy--History--Sources.
Harvard subject headings:
Anthroposophy.
Hübbe-Schleiden, Wilhelm, 1846-1916.
Theosophy.
Princeton subject headings: