Extraction of Alum_1, Alum solutions are filled into various containers, water is added and often stirred, woodcut, p. 458, (Liber duodecimus), Manuel, Hans Rudolf (graveur sur bois), 1556, Georgius Agricola: De re metallica libri XII: quibus officia, instrumenta, machinae, ac omnia denique ad metallicam spectantia, non modo luculentissime describuntur, sed & per effigies (...). Basileae: [Froben], 1556

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Extraction of Alum_1, Alum solutions are filled into various containers, water is added and often stirred, woodcut, p. 458, (Liber duodecimus), Manuel, Hans Rudolf (graveur sur bois), 1556, Georgius Agricola: De re metallica libri XII: quibus officia, instrumenta, machinae, ac omnia denique ad metallicam spectantia, non modo luculentissime describuntur, sed & per effigies (...). Basileae: [Froben], 1556.

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