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Lithostratigraphy of the Ripon Formation (Ecca Group), Including the Pluto's Valve, Wonderfontein and Trumpeters Members

Michael Richard JohnsonC. S. Kingsley

出版	South Africa. Department of Mineral and Energy Affairs, 1993
URL	http://books.google.com.hk/books?id=IWfjrQEACAAJ&hl=&source=gbs_api