1. Office of the Texas State Chemist, Texas Agricultural Experiment Station, College Station, Texas 77841
2. Center for Grain and Animal Health Research, Agricultural Research Service, U.S. Department of Agriculture, Manhattan, Kansas 66502
3. Biological and Agricultural Engineering Department, Texas A&M University, College Station, Texas 77843
4. Cotton Ginning Research Unit, Agricultural Research Service, U.S. Department of Agriculture, Stoneville, Mississippi 38776