1. U.S. Army Engineer Res. and Development Ctr., Cold Regions Res. and Eng. Lab., 72 Lyme Rd., Hanover, NH 03755,
2. U.S. Army Engineer Res. and Development Ctr., Information Technol. Lab., Vicksburg, MS
3. U.S. Army Engineer Res. and Development Ctr., Cold Regions Res. and Eng. Lab., Hanover, NH