{"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, ... and Using Them, Are Concisely Explained.","author_name":"John Fry Heather","thumbnail_url":"https://www.ebooknetworking.net/books/B00/2Q0/bigB002Q0WOJW.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B002Q0WOJW.html\">A Treatise on Mathematical Instruments, Including Most of the Instruments Employed in Drawing, for Assisting the Vision, in Surveying and Levelling, ... and Using Them, Are Concisely Explained.</a>","width":400,"height":300}