Geology of coal ; Examination of coal properties ; Drifts, slopes, and shafts ; Methods of working
著者
書誌事項
Geology of coal ; Examination of coal properties ; Drifts, slopes, and shafts ; Methods of working
（International library of technology, 87）
International Textbook, c1907
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Geology of coal ; Drifts, slopes and shafts ; Methods of working