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Coal Resources of the United States, January 1, 1967
Paul AverittGeological Survey (U.S.)
其他書名
A Summary and Analysis of Information Concerning the Quantity and Distribution of Coal in the United States
出版United States Department of the Interior, Geological Survey, 1969
URLhttp://books.google.com.hk/books?id=s_KRtwEACAAJ&hl=&source=gbs_api