1. a U.S. Army Engineer Research and Development Center Waterways Experiment Station 3909 Halls Ferry Road, Vicksburg, MS 39180-6199
2. b U.S. Army Cold Regions Research and Engineering Laboratory 72 Lyme Road, Hanover, NH 03755-1290
3. c AScI Corporation 1365 Beverly Road McLean, VA 22101-3632