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Geology of the Buchanan Quadrangle, Liberia

其他書名	Prepared in Cooperation with the Liberian Geological Survey Under the Sponsorship of the Agency for International Development, U.S. Department of State
出版	U.S. Government Printing Office, 1976
URL	http://books.google.com.hk/books?id=6obpwAEACAAJ&hl=&source=gbs_api

註釋Definitions of coal resource classification terms used by the U.S. Bureau of Mines and U.S. Geological Survey.