Showing 1 - 3 results of 3 for search '"United States."', query time: 0.18s Refine Results
  1. 1
    Basic estimated capital investment and operating costs for underground bituminous coal mines : mines with annual production of 1.06 to 4.99 million tons from a 72-inch coalbed /
    Subjects: “...Coal mines and mining United States Costs....”
    Government Document Book
  2. 2
    Basic estimated capital investment and operating costs for underground bituminous coal mines developed for longwall mining : mines with annual production 1.3 and 2.6 million tons by longwall mining from a 48-inch coalbed /
    Subjects: “...Coal mines and mining United States Cost of operation....”
    Government Document Book
  3. 3
    Basic estimated capital investment and operating costs for underground bituminous coal mines developed for longwall mining /
    Subjects: “...Coal mines and mining United States Cost of operation....”
    Government Document Book
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