{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"A practical and theoretical system of arithmetic: Containing several new methods of operation, and a new system of proportion; with theoretical explanations ... and a brief practical system of book-keeping","author_name":"George. Willson","thumbnail_url":"https://www.ebooknetworking.net/books/B00/3AM/bigB003AM7VFC.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B003AM7VFC.html\">A practical and theoretical system of arithmetic: Containing several new methods of operation, and a new system of proportion; with theoretical explanations ... and a brief practical system of book-keeping</a>","width":400,"height":300}