I'm on the Fly Baby forum and one of the members posted an Air Force manual to his site. He got it from some guy in Austrailia. It's ANC-18 Bulletin. Everything you could ever want to know about design of wood for aircraft structures.
We ask questions about the wood inthe wings quite often here. Might be a good thing to have in the Handy Resources.
It's about 200 pages. Eight pages devoted to the table of contents. I've got my copy already. : )
ANC-18.pdf note: 11mb download. (right click the file and Save As)
<edited to add pdf - beej