1. Environment Canada; Room 300, 2365 Albert St. Regina SK S4P 4K1 Canada
2. Agriculture and Agri-Food Canada; 107 Science Place Saskatoon SK S7N 0X2 Canada
3. Dep. of Soil Science, Faculty of Agricultural and Food Sciences; Univ. of Manitoba; 380 Ellis Building Winnipeg MB R3T 2N2 Canada