{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"A Treatise On Simple And Compound Ophthalmic Lenses: Their Refraction And Dioptric Formulae, Including Tables Of Crossed Cylinders And Their Sphero-cylindrical Equivalents - Primary Source Edition","author_name":"Charles Frederick Prentice","thumbnail_url":"https://www.ebooknetworking.net/books/129/405/big1294055941.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1294055941.html\">A Treatise On Simple And Compound Ophthalmic Lenses: Their Refraction And Dioptric Formulae, Including Tables Of Crossed Cylinders And Their Sphero-cylindrical Equivalents - Primary Source Edition</a>","width":400,"height":300}