1. Rice Exp. Station Calif. Coop. Rice Res. Foundation Biggs CA 95917
2. Dep. of Agronomy and Horticulture Univ. of Nebraska Lincoln NE 68583
3. Dep. of Crop and Soil Sciences Washington State Univ. Pullman WA 99164
4. Dep. of Biometry Univ. of Nebraska Lincoln NE 68583
5. Dep. of Biology and Microbiology South Dakota State Univ. Brookings SD 57007