Site was Alexa top 20000 My site has been removed from google index. We've reviewed your site and we believe that some or all of your pages still violate our quality guidelines. In order to preserve the quality of our search engine, pages from http://ebooknetworking.net/ not appear or may not rank as highly in Google's search results, or may otherwise be considered to be less trustworthy than sites which follow the quality guidelines. If you wish to be reconsidered again, please correct or remove all pages that are outside our quality guidelines. When such changes have been made, please visit Regards Alex
total number of pages before it was banned in index was 10,00,000+ in November i renewed domain for 8 years Regards Alex
make sure you don't have a virus on your website. Check each and every single page. Post on google webmaster forum and an employee will answer why you were banned. wait 3 months and comeback.
i have seen lots of pdf books got banned,so its not new that you also got banned,google is continuously banning pdf search engines
I guess, your competitor has filed a spam report against your website. After a quick look on your website, your text size looks like a blatant attempt of fooling the search engines with its large font size. Just format your text with right font size and file a reconsideration request after that.