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London, Wellcome Institute MS. 3876. 39 + 49 pages. Late 17th Century. Eirenaeus Philaletha. Fonte della Filosophia Chimica dell'Anonimo Filaleta. Breve conducimento a mano al possesso del Rubino Celeste.
[These two works were published in 'Tres tractatus de metallorum transmutatione', Amsterdam, 1668.]
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