1. Dep. of Soil ScienceUniv. of Wisconsin1525 Observatory Dr.MadisonWI53706‐1299USA
2. Ohio State Univ.Byrd Polar Research Ctr.1090 Carmack Rd.ColumbusOH43210‐1002USA
3. Dep. of GeographyUniv. of CincinnatiCincinnatiOH45221USA
4. Dep. of GeographyUniv. of DelawareNewarkDE19716USA
5. International Permafrost Assoc.P.O. Box 7Woods HoleMA02543USA