I just got a new book in today called Ponderosa Pines as Bonsai by Larry Jackel. Talk about a great book. I dont actually enjoy reading but I finished this book already. There is a ton of good info in it for those who are interested in ponderosas. Lots of illustrations to go with the techniques he talks about which helps me since I'm more of a visual learner. I have been looking for a book that gives good guidelines for when work can and should be done and this is going to be a good help. I figured I would share as I'm sure I'm not the only person out there looking for info. I got my copy from stone lantern.