{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"History of the Logarithmic Slide Rule and Allied Instruments","author_name":"Cajori, Florian","thumbnail_url":"https://www.ebooknetworking.net/books/noimage.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1879335522.html\">History of the Logarithmic Slide Rule and Allied Instruments</a>","width":400,"height":300}