{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"A Treatise On Mathematical Instruments, Including Most Of The Instruments Employed In Drawing, For Assisting The Vision, In Surveying And Levelling, ... And For Measuring The Angles Of Crystals","author_name":"John Fry Heather","thumbnail_url":"https://www.ebooknetworking.net/books/144/604/big1446043800.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1446043800.html\">A Treatise On Mathematical Instruments, Including Most Of The Instruments Employed In Drawing, For Assisting The Vision, In Surveying And Levelling, ... And For Measuring The Angles Of Crystals</a>","width":400,"height":300}