1. Dep. of Civil EngineeringUniv. of PeradeniyaPeradeniyaSri Lanka20400
2. Dep. of Soil and Physical SciencesLincoln Univ.P.O. Box 85084LincolnNew Zealand7647
3. Dep. of Soil and Physical SciencesLincoln Univ. P.O. Box 85084 LincolnNew Zealand 7647
4. Plant & Food Research Ltd. GeraldSt. LincolnNew Zealand 7608
5. Dep. of Geosciences and Natural Resource Management Center for Permafrost (CENPERM) Univ. of Copenhagen Øster Voldgade10 CopenhagenDenmark DK‐1350