I have an copy of Aquatic Entomology by McCafferty which is more or less the fly fisherman's bible of aquatic insects. Since falconry and coaching archery take up most of my "leisure" time I might as well turn this into cash or trade for something I will use. If you can use it more than me make me an offer. I know that a new copy goes for $155 on Amazon but have no idea what the going rate is for a used one.