Columbia subject headings:
Mysticism--Russia--History--19th century.
Mysticism--Russia--History--20th century.
Philosophy, Russian--History--19th century.
Philosophy, Russian--History--20th century.
Theology, Doctrinal--Russia--History--19th century.
Theology, Doctrinal--Russia--History--20th century.
Harvard subject headings:
Mysticism--Russia--History--19th century.
Mysticism--Russia--History--20th century.
Mysticism--Russia--History.
Philosophy, Russian--History--19th century.
Philosophy, Russian--History--20th century.
Philosophy, Russian--History.
Theology, Doctrinal--Russia--History--19th century.
Theology, Doctrinal--Russia--History--20th century.
Princeton subject headings: