1. Los Alamos National Lab. MS J577 Los Alamos NM 87545
2. Iowa Inst. for Hydraulic Research Univ. of Iowa Iowa City IA 52242
3. Dep. of Plants, Soils and Biometeorology Utah State Univ. Logan UT 84322
4. Dep. of Biological and Irrigation Engineering Utah State Univ. Logan UT 84322
5. USDA National Soil Tilth Lab. Ames IA 50011