1. Coastal and Hydraulics Laboratory U.S. Army Engineer Research & Development Center Vicksburg, MS 391
2. Portland District U.S. Army Corps of Engineers Portland, OR 97204, U.S.A.
3. RPS Group Plc. Johns Island, SC 29455, U.S.A.
4. Environmental Tracing The Coach House, Bannachra Helensburgh, Scotland G84 9EF, U.K.