1. Dep. of Soil Science, Box 7619North Carolina State Univ.RaleighNC27695‐7619
2. Savannah River National Lab.Washington Savannah River CompanyBldg. 773‐42AAikenSC29808
3. Dep. of Soil and Crop SciencesTexas A&M Univ.370 Olsen Blvd.College StationTX77843