I agree with the others, RWB is most certainly the Bryce bible and no other book even comes close. Amazon also carries used books in good condition at reduced prices, see if those prices meet your expectations. Personally, I wouldn't spend my money on any other Bryce book. I believe that the only aspect of Bryce in which RWB can't help you with is the tree lab and metaballs. But all you need to know about that is already covered in the Bryce 5 manual and any other questions that need answers, you can ask here. Good luck!