Regional shifts in the bituminous coal industry : a summary : what have been their extent, their causes and their effects? : what can be done about instability in the soft coal industry?
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Regional shifts in the bituminous coal industry : a summary : what have been their extent, their causes and their effects? : what can be done about instability in the soft coal industry?
（Bureau of Business Research monographs, no. 4）
Bureau of Business Research, University of Pittsburgh, 1936
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