{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"A Treatise On the Principal Mathematical Drawing Instruments Employed by the Engineer, Architect and Surveyor. with a Description of the Theodolite, by H.J. Castle","author_name":"Simms, Frederick Walter","thumbnail_url":"https://www.ebooknetworking.net/books/B00/A61/bigB00A61BXQS.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B00A61BXQS.html\">A Treatise On the Principal Mathematical Drawing Instruments Employed by the Engineer, Architect and Surveyor. with a Description of the Theodolite, by H.J. Castle</a>","width":400,"height":300}