{"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 Use. With an Appendix, and Tables.","author_name":"Frederick Walter Simms","thumbnail_url":"https://www.ebooknetworking.net/books/B00/2KW/bigB002KW4VA6.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-B002KW4VA6.html\">A Treatise on the Principal Mathematical Instruments Employed in Surveying Levelling and Astronomy: Explaining Their Construction, Adjustments, and Use. With an Appendix, and Tables.</a>","width":400,"height":300}