International Permafrost Association, P.O. Box 7, Woods Hole, MA 02543 United States ; Department of Geology, The University Centre on Svalbard, P.O. Box 156, Longyearbyen, 9171 Norway
Department of Earth Sciences, Uppsala University, Villavägen 16, Uppsala, S-752 36 Sweden
Alfred Wegener Institute, Telegrafenberg A43, Potsdam, D-14773 Germany
Department of Geology, The University Centre on Svalbard, P.O. Box 156, Longyearbyen, 9171 Norway