1. Research Assoc., Dept. of Civ. Engrg., Rm. 1-376, Massachusetts Inst. of Tech., Cambridge, Mass. 02139
2. Consulting Geotechnical Engr., Foxboro, Mass
3. Prof. Emeritus, Dept. of Civ. Engrg., Massachusetts Inst. of Tech., Rm. 1-378, Cambridge, Mass. 02139