1. Prof. Emeritus, Dept. of Agr. and Irrigation Engrg., Utah State Univ., Logan, Utah 84322
2. Hydr. and Irrigation Engr., Wright-McLaughlin Engrg., Denver, Colo.
3. Irrigation Engr., Pitcher Irrigation Co., Preston, Idaho
4. Assoc. Prof., Dept. of Agr. and Irrigation Engrg., Utah State Univ., Logan, Utah 84322