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A scientific review of the modernized mine crushed stone production line

Figure 11 US Production of Selected Commodities 2000 Billion Dollars Balance 239 Crushed Stone 84 Phosphate 93 Gold amp Silver 35 Lead amp Zinc 15 Copper 28 Iron 16 PotashSoda Ash amp Borates 16 Coal 168 Source US Department of Interior US Geological Survey Minerals Handbook Statistical Summary 2000

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