Planenherd_2, The ores are washed in a tapered tree trunk with graded planherds, woodcut, p. 242, (Liber octavus), 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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Planenherd_2, The ores are washed in a tapered tree trunk with graded planherds, woodcut, p. 242, (Liber octavus), 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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