Underground gasification of coal : Second experiment in preparing a path through a coalbed by hydraulic fracturing
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書誌事項
Underground gasification of coal : Second experiment in preparing a path through a coalbed by hydraulic fracturing
（U. S. Bureau of Miner, Report of Investigations, 5808）
Hirakawa Bunken Seminar, [1961]
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***遡及データをもとにした入力である
copy. Originally Published: Washington : United States Department of The Interior, Burear of Mines , [1961]