Bad idea. Some of the 4D stuff overlaps with the 3000's. I think one list is the best idea. Also 3000 stuff overlaps with 4D's. -- Brent L. Bates NASA-Langley Research Center M.S. 294 Hampton, Virginia 23665-5225 (804) 864-2854 E-mail: blbates at aero4.larc.nasa.gov or blbates at aero2.larc.nasa.gov