I was pretty sure you needed to buy the book before you get that, I tried to follow links for a while to get the RWH pdf before and didn't succeed. Edit: Seems

I was pretty sure you needed to buy the book before you get that, I tried to follow links for a while to get the RWH pdf before and didn't succeed. Edit: Seems that they are linking only to the site and not a pdf for RWH so it could well be legal :)