1. Professor, Univ. of Idaho, Kimberly, ID, 84331.
2. Retired Professor, Univ. of California, 804 W. 8th St., Davis, CA 95616.
3. Professor, Katholic Univ., Leuven, Belgium.
4. Country Representative, FAO, Madagascar, Africa; formerly, Chief Officer, FAO, Rome, Italy;
5. Professor, Institute of Agronomy, Technical Univ. of Lisbon, Lisbon, Portugal.