{"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, leveling, and astronomy: Explaining their construction, adjustments, and use : with an appendix and tables","author_name":"Frederick Walter Simms","thumbnail_url":"https://www.ebooknetworking.net/books/noimage.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B0008A6VVE.html\">A treatise on the principal mathematical instruments employed in surveying, leveling, and astronomy: Explaining their construction, adjustments, and use : with an appendix and tables</a>","width":400,"height":300}