黄金开采。在罐子里研磨的矿石用大水洗净,然后经过铜板,将金与其他材料分开。19世纪末的铬酸盐学。(Gold mining. The ore grinding in the jar is washed with great water and then passes over the copper plates to separate the gold from the other materials. Chromolitography of the late 19th century.)未知艺术家 |
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日期不详 · chromolithograph
· 图片ID: 918066
Private Collection / Bridgeman Images |
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