1. Retired, 115 Fox Run Ln., Vicksburg, MS 39180; formerly, Senior Research Scientist, Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Rd., Vicksburg, MS 39180.
2. Research Physicist, Geotechnical and Structures Laboratory, U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Rd., Vicksburg, MS 39180 (corresponding author).