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London, Wellcome Institute MS. 3434. 149 folios. 315x205mm. 19th Century [c. 1895] Joannes à Marck. [Transcript of 13 letters on alchemy, written 1617-1619. Ex manuscripto Comitis Stampfer. Transcript in German, written mainly by Julius Kohn, with holograph preface in French.]
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