Columbia subject headings:
Harvard subject headings:
Ideology--Religious aspects--Congresses.
Mysticism in literature--Congresses.
Mysticism--Germany--History--20th century--Congresses.
National socialism and philosophy--Congresses.
Totalitarianism--History--20th century--Congresses.
Princeton subject headings:
Ideology--Religious aspects--Congresses.
Mysticism in literature--Congresses.
Mysticism--Germany--History--20th century--Congresses.
National socialism and philosophy--Congresses.
Totalitarianism--History--20th century--Congresses.