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Coal Resources of the United States, January 1, 1974
Paul Averitt
其他書名
A Summary of Information Concerning the Quantity and Distribution of Coal in the United States
出版U.S. Government Printing Office, 1975
URLhttp://books.google.com.hk/books?id=erA8jUiQAwUC&hl=&source=gbs_api
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註釋A summary of information concerning the quantity and distribution of coal in the United States.