1. Chf., Operational Analysis Branch, Div. of Tech. Operations, Bur. of Solid Waste Mgt., Environmental Healtb Service, Public Healtb Service, U.S. Dept. of Healtb, Education, and Welfare
2. Staff Engr., Div. of Res. and Development, Bur. of Solid Waste Mgt., Environmental Health Service, Public Health Service, U.S. Dept. of Healtb Education and Welfare