{"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, ... Crystals: In Which Their Construction, And...","author_name":"John Fry Heather","thumbnail_url":"https://www.ebooknetworking.net/books/124/734/big1247347494.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1247347494.html\">A Treatise On Mathematical Instruments: Including Most Of The Instruments Employed In Drawing, For Assisting The Vision, In Surveying And Levelling, ... Crystals: In Which Their Construction, And...</a>","width":400,"height":300}