Digging for gold and other precious metals
Por um escritor misterioso
Descrição
Where do the metals we use come from and what determines where we get them from? Dr Julie Robson focuses on the highly sought-after metal of gold, which actually occurs with other metals including silver, copper and lead.
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Digging for gold and other precious metals
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Gold processing, Refining, Smelting & Purifying
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por adulto (o preço varia de acordo com o tamanho do grupo)
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