Scott Cunningham has some good books for "green" witchcraft. To me green witchcraft is any magickal practice that emphisises on the use of nature and things within it; herbs, fungi, cosmic forces, trees and other plants, elemental power all especially. For folk magick I'd look into voodoo, appalachian folk magic, shamanism, neo-druidism, anything to do with native american/australian mysticism and medicine (from what I've read so far I've found Hopi, Navajoe and Aboriginal philosophies to be good) and chinese mysticism. Why so many different subjects? For a good well rounded knowledge and understanding.
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