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?
著者
書誌事項
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