1. Assistant Professor, Oregon State Univ., Corvallis, OR 97331 (corresponding author). E-mail: armin.stuedlein@oregonstate.edu
2. State Geotechnical Engineer, Materials Laboratory, Washington State Dept. of Transportation, State Materials Laboratory, Olympia, WA 98504.
3. Professor Emeritus, Univ. of Washington, Seattle, WA 98195.
4. Geotechnical Consultant, 210 Boxelder Lane, Roswell, GA 30076.