{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"The Detection Of Colorblindness And Imperfect Eyesight By The Methods Of Dr. Snellen, Dr. Daae, And Prof. Holmgren (1881)","author_name":"Charles Roberts","thumbnail_url":"https://www.ebooknetworking.net/books/143/701/big1437019242.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-1437019242.html\">The Detection Of Colorblindness And Imperfect Eyesight By The Methods Of Dr. Snellen, Dr. Daae, And Prof. Holmgren (1881)</a>","width":400,"height":300}