By Albert von Schrenck-Notzing – Phenomena of Materialisation: A Contribution to the Investigation of Mediumistic Teleplastics. trans. E. E. Fournier d’Albe. New York: E.P. Dutton & Co, 1920. (Republished in 1923)., Public Domain, https://commons.wikimedia.org/w/index.php?curid=47528856
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