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Sample of copper slag, from the Bogoyavlensky Copper Mines, Government of Orenburg, Russia
Sample of copper slag, from the Bogoyavlensky Copper Mines, Government of Orenburg, Russia
Sample of copper slag, from the Bogoyavlensky Copper Mines, Government of Orenburg, Russia
Sample of copper slag, from the Bogoyavlensky Copper Mines, Government of Orenburg, Russia
One of a collection of Cape of Good Hope products from the Paris Exhibition, 1867 - a sample of copper slag