1. Dep. of Renewable Resources1000 E. University Ave., Univ. of WyomingLaramieWY82071‐3354
2. Canadian Forest Service, Natural Resources CanadaPacific Forestry Centre506 West Burnside Rd.VictoriaBCCanadaV8Z 1M5
3. USDA‐ARSHigh Plains Grasslands Research Station, Rangeland Resource Research Unit8408 Hildreth Rd.CheyenneWY82009
4. Environment and Natural Resource Institute, Univ. of Alaska3211 Providence Dr.AnchorageAK99508