backhertz wroteWood could probably warrant a forum totally devoted to it... It continues to amaze me. The more I learn, the more I realize I don't know... But I will accept anything I can learn & would prefer to go to only one forum myself. I find the topics here to be very broad ranged & interesting.
The wood experts in the U.S.A. are the guys at the Forest Products Laboratory,in Madison Wisconsin. Here is their site - Yes it is the Federal Government -
http://www.fpl.fs.fed.us/products/publications/several_pubs.php?grouping_id=100&header_id=p
They used to publish an annual book titled "The Wood Handbook" With the coming of the internet - they went electronic. Maybe they still publish a hard copy, I haven't checked. The annual books in the 1960s and 70s were about two inches thick. That's a lot of material!
One of the very best hard cover books I have found that discusses wood growth, characteristics and identification, etc. is "Identifying Wood" by R. Bruce Hoadley. This volume is just as handy as the old wood textbooks we had in Forestry School. I think you can buy one of those books on the internet.