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![](./img/clear.gif) 1.- A Textbook of ore dressing
Locke, Charles E.11; Richards, Robert H.
New York: McGraw-Hill Book Company, 1925
Peñarroya M/1-4.18
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![](./img/clear.gif) 2.- Ore dressing
Richards, Robert H.
New York ; London: The Engineering and Mining Journal, 1903
II / 28 - 6 - 12 / 13
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