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A Key to the Intellectual Arithmetic, Containing Answers and Solutions of the More Difficult Examples in that Work
Benjamin Greenleaf
其他書名
For the Use of Teachers
出版R.S. Davis & Company, 1859
URLhttp://books.google.com.hk/books?id=QGDsOjj1nEYC&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN