{"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; Explaining Their Construction, Adjustments, and ... With an Appendix and Cables (Classic Reprint)","author_name":"Frederick W. Simms","thumbnail_url":"https://www.ebooknetworking.net/books/133/200/big1332001726.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1332001726.html\">A Treatise on the Principal Mathematical Instruments: Employed in Surveying, Levelling, and Astronomy; Explaining Their Construction, Adjustments, and ... With an Appendix and Cables (Classic Reprint)</a>","width":400,"height":300}