{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"A treatise on the principal mathematical instruments employed in surveying, levelling, and astronomy..","author_name":"Frederick Walter Simms","thumbnail_url":"https://www.ebooknetworking.net/books/117/705/big1177052636.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1177052636.html\">A treatise on the principal mathematical instruments employed in surveying, levelling, and astronomy..</a>","width":400,"height":300}