1. USDA Agricultural Research Service, Soil Drainage Research Unit, Columbus, Ohio, USA
2. University of Guelph, School of Environmental Sciences, Guelph, Ontario, Canada
3. University of Southern Queensland, School of Mechanical and Electrical Engineering, Toowoomba, Queensland, Australia
4. Society of Exploration Geophysicists, Near Surface Geophysics & Mining and Mineral Exploration, Tulsa, Oklahoma, USA