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De re metallica . en Woodcut from of De re metallica Vom Bergwerk XII Bcher Ore processing with stamp mill shaking table sluice pan and perforated metal plates Holzschnitt Seite aus De re metallica Vom Bergwerk XII Bcher Aufbereitung mit Pochwerk Planherd Gerinne Sichertrog und Lochblechen digitalis unikoeln de pdf Georgius Agricola