"B-OK" is a free e-book site founded in 2009 free e-books, the site is known as the world's largest electronic library, currently contains more than 350,000 e-books, if you like to read the original English e-books, you may wish to collect the site, the full English site to find of course also need English.

"B-OK" adds ISBN ( International Standard Book Number), readers can search according to keywords, but also through the ISBN code search, in addition to providing a download history to facilitate viewing the history of all books provide detailed information about the book, so you understand the full range of each book.