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Essentials of Business Arithmetic. By H.F. Hemstock. An Adaptation ... of Essentials of Business Arithmetic: Brief Course, by Edward M. Kanzer and William L. Schaaf. 3rd Ed. Revised
出版Harrap, 1967
URLhttp://books.google.com.hk/books?id=UT8HMwEACAAJ&hl=&source=gbs_api