1. a Geo-Centers, Inc. , Gunpowder Branch Box 68, Aberdeen Proving Ground, MD, 21010-0068
2. b Reseach and Technology Directorate, U.S. Army ERDEC , Aberdeen Proving Ground, MD, 21010
3. c U.S. Army European Research Office , USARDSG-UK, PSC 802 Box 15, FPO, AE, 09499-1500