1. Extension Associate, Dept. of Biological and Agricultural Engineering, North Carolina State Univ., Campus Box 7625, Raleigh, NC.
2. Associate Professor and Extension Specialist, Dept. of Biological and Agricultural Engineering, North Carolina State Univ., Campus Box 7625, Raleigh, NC.
3. Extension Specialist, Dept. of Biological and Agricultural Engineering, North Carolina State Univ., Research IV 3200, Box 7637, Raleigh, NC.