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A New Method of Measuring the Structure of Coal Seams and of Calculating the Quantity of Saleable Product Per Surface Unit

P. A. G. BeugelsJ. BloemendalW. F. M. Kimpe

出版	National Coal Board, Translating and Interpreting Branch, Secretary's Department, 1961*
URL	http://books.google.com.hk/books?id=o6V7zgEACAAJ&hl=&source=gbs_api