{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"The Art of Mental Calculation: addition & subtraction","author_name":"Arthur Benjamin","thumbnail_url":"https://www.ebooknetworking.net/books/149/521/big1495219968.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1495219968.html\">The Art of Mental Calculation: addition &amp; subtraction</a>","width":400,"height":300}