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London, Wellcome Institute MS. 582. 105 pages. 205x140mm. Late 16th Century. 1. pp1-72 [Here ascribed to Roger Bacon.] Opera grande et reale fatta con l'olio... Recipe olio di Antimonio fatta di quello Antimonio della miniera che non sia stato colato...
2. pp79-105 [Here ascribed to Roger Bacon.] Rogerius Bacconus de antimonio. De lapide Albetio seu de Antimonio secundum quadripartite ubi sciendum est in primus de Antimonio secundum Rogerium Bacconum. [This work was printed in 1672 as 'Liber secretus' under the name of Artephius.]
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