Dick, I'll sure stop by the next time I'm down that way. Rich, you can ret it like Jamie said. The easiest caveman method is to just keep an eye out when I'm walking in the woods. If you check downed poplar logs and limbs (which are usually all over the place), now and then you will find naturally retted bark that's at just the right stage. You can peel off a bunch, dry it, and store it until you need it. Some other trees that have good inner bark bast I have used are basswood, slippery elm, walnut, locust, mulberry, and red maple.