File:Mining and Scientific Press - 1868-08-22 - California Powder Works.jpg
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![File:Mining and Scientific Press - 1868-08-22 - California Powder Works.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/7/71/Mining_and_Scientific_Press_-_1868-08-22_-_California_Powder_Works.jpg/341px-Mining_and_Scientific_Press_-_1868-08-22_-_California_Powder_Works.jpg?20130222143728)
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