1. Agric. and Agri‐Food Can. Box 1000A RR 3 Brandon MB Canada R7A 5Y3
2. USDA, Cent. Plains Res. Cent. Box 400 Akron CO 80720
3. Agric. and Agri‐Food Can. Box 3000 Lethbridge AB Canada T1J 4B1
4. Dep. of Land Resour. and Environ. Sci. Univ. of Montana Bozeman MT 59717–0312