I would think a complete set of the Foxfire books would be valuable.
"Well, we're all victims of our own gene pool. Someone must have peed in yours." - Walter Bishop, from Fringe.
"Then tell me this: Why would you want to hang around people that get uncomfortable, or even scared, about that kind of thing?" "Maybe to feel normal," I said. He laughed. "Normal's not all it's cracked up to be." "You think?" "Hell, I know." - from Spirits In The Wires, by Charles de Lint.