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The Schoolmasters Assistant: Being a Compendium of Arithmetic, Both Practical and Theoretical. In Five Parts ... To which is Prefixt, an Essay on the Education of Youth ... A New Edition. Corrected. By Thomas Dilworth ..

出版	W. Osborne and T. Griffin, and Mozley and Company Gainsbrough, 1793
URL	http://books.google.com.hk/books?id=Mg6cP3UzhdYC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN