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Coal Resources of the United States, January 1, 1967
Paul Averitt
出版U.S. Government Printing Office, 1969
URLhttp://books.google.com.hk/books?id=pyUUOAKt0LIC&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN
註釋A summary and analysis of information concerning the quantity and distribution of coal in the United States. Supersedes Bulletin 1136.