1. Mech. Engr., U.S. Army Engr., Res. and Devel. Ctr., Cold Regions Res. and Engrg. Lab., Hanover, N.H. 03755.
2. Chemical Engr., U.S. Army Engr. Res. and Devel. Ctr., Cold Regions Res. and Engrg. Lab., Hanover, N.H.
3. Res. Phys. Sci., U.S. Army Engr. Res. and Devel. Ctr., Cold Regions Res. and Engrg. Lab., Fairbanks, AK 99703.