English Engineer And Inventor Sir Henry
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Georgius Agricola 1494-1555, German
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Smelting Of Copper, 1683
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The Bessemer Process
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Refining Copper Using The Hungarian
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A Portable Smelting Furnace
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Charcoal Burning, 1540 #1
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Ironworks
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Assayer Testing Samples Of Gold
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Using Bellows To Increase The Draught
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The Mounting Of A Workshop
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We Will Turn The Five-year Plan
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Washing Ore To Extract Gold, 1683 #1
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Charcoal Burning, 1540
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Preparation Of Copper And Silver
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The Studio Of Etienne Delaune, 1576
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