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Basic estimated capital investment and operating costs for underground bituminous coal mines. Mines with annual production of 1.03 to 3.09 million tons from a 48-inch coalbed

Title:Basic estimated capital investment and operating costs for underground bituminous coal mines. Mines with annual production of 1.03 to 3.09 million tons from a 48-inch coalbed
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Note:U.S. Bureau of Mines, 1974
  
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Subject:Bituminous coal -- Costs
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