{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"A   Treatise on Mathematical Instruments, Including Most of the Instruments Employed in Drawing, for Assisting the Vision, in Surveying and Levelling,","author_name":"Heather J. F. (John Fry) D. 1886","thumbnail_url":"https://www.ebooknetworking.net/books/131/452/big1314522353.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1314522353.html\">A   Treatise on Mathematical Instruments, Including Most of the Instruments Employed in Drawing, for Assisting the Vision, in Surveying and Levelling,</a>","width":400,"height":300}