{"version":"1.0","type":"rich","provider_name":"EbookNetworking","provider_url":"https://www.ebooknetworking.net","title":"Combinatorics of Train Tracks. (AM-125)","author_name":"R. C. Penner, John L. Harer","thumbnail_url":"https://www.ebooknetworking.net/books/noimage.jpg","thumbnail_width":330,"thumbnail_height":500,"html":"<a href=\"https://www.ebooknetworking.net/books_detail-0691025312.html\">Combinatorics of Train Tracks. (AM-125)</a>","width":400,"height":300}