Columbia subject headings:
Cults--History--20th century.
Occultism--History--20th century.
Religion--History--20th century.
Harvard subject headings:
Cults--History--20th century.
Occultism--History--20th century.
Religion--History--20th century
Princeton subject headings:
Cults--History--20th century.
Occultism--History--20th century.
Religion--History--20th century.