Hartmann's Who's Who in Occult, Psychic and Spiritual Realms

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Franz Hartmann (1838–1912) was a German physician, theosophical writer, and occultist associated with the late nineteenth-century occult revival. He wrote extensively on Theosophy, Rosicrucianism, Paracelsian ideas, and mysticism, helping to popularize esoteric philosophy in Europe and the United States.