Coal mining in Europe : a study of practices in different coal formations and under various economic and regulatory conditions compared with those in the United States
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Coal mining in Europe : a study of practices in different coal formations and under various economic and regulatory conditions compared with those in the United States
(Bulletin / United States Department of the Interior, Bureau of Mines, 414)
U.S. Government Printing Office, 1939
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記述は遡及データによる