1. Univ. of Missouri, Dep. of Industrial and Manufacturing Systems Engineering E3437 Thomas and Nell Lafferre Hall Columbia MO 65211
2. Michigan State Univ., Kellogg Biological Station and Dep. of Crop and Soil Sciences 576 Plant and Soil Sciences Building East Lansing MI 48824‐1325
3. Michigan State Univ., Dep. of Crop and Soil Sciences 440A Plant and Soil Sciences Building East Lansing MI 48824‐1325