I read a couple books about 20 years ago by Peter Jenkins and one of them was about walking across China and things related to it. Very popular at the time. He's a good writer. I've still got a couple of his books about walking across America. Unfortunately old travel books I'd guess are about the least likely thing to get ebook'd hehe... But you can find it as paper on amazon, or you can ask the author about it as an ebook.. Here is his web page.
http://www.peterjenkins.com/books_profile_AC.htm