I've been playing Harmonica for about 35 years(Jeez! Has it been that long? I should be a lot better)and when I started there was exactly ONE insructional book. "Blues Harp" by Tony Glover, Oak Publications. I believe it's still in print, and is an excellent starting point. The most comprehensive Harmonica instruction I've ever seen (regardless of what style you want to play)is the Diatonic Reference at http://www.angelfire.com/tx/myquill/ What a terrific resource.