1. Members, ASCE
2. Struct. Engr., RETTEW Associates, Inc., Harrisburg, PA 17111.
3. Distinguished Prof. of Agric. and Biol. Engrg., Pennsylvania State Univ., University Park, PA 16802.
4. Instructor, Dept. of Civ. and Envir. Engrg., Pennsylvania State Univ., University Park, PA.
5. Asst. Prof. of Civ. Engrg., Dept. of Civ. and Envir. Engrg., Pennsylvania State Univ., University Park, PA.