Or we could all just download MIL-S-6073, which has to do with aircraft grade Spruce, and is available from http://members.eaa.org/home/homebuilders/building/wood/1Military%20Specification%20MIL-S-6073_%20%20Aircraft%20Spruce.pdf (and I don't want to hear that this link doesn't work, because it would if you'll just paste it ALL into your browser's URL box!).
Mark Langford, Harvest, AL see homebuilt airplane at http://www.N56ML.com email to N56ML "at" hiwaay.net