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Coal Resources of the United States

Alfred E. TorreyFrank A. SwensonGeological Survey (U.S.). Topographic Division. Research and Technical Control BranchGeorge J. EdwardsIvan D. YostRolland William CarterRoy Edwin OltmanPaul AverittHubert Jerome TracyPaul Livingston ApplinW. Kenneth Bach

其他書名	A Progress Report, November L, 1950
出版	U.S. Department of the Interior, Geological Survey, 1949
URL	http://books.google.com.hk/books?id=pUPrtGsGeqIC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN