1. Natural Resources Canada, CANMET; 555 Booth Street, Office 332A Ottawa ON Canada K1A 0G1
2. Canada Centre for Remote Sensing; 588 Booth Street, 4th floor Ottawa ON Canada K1A 0Y7
3. Department of Soil Science; North Carolina State University; Box 7619, 3235 Williams Hall Raleigh NC 27695-7619
4. National Institute of Environmental Health Sciences; P.O. Box 12233 Research Triangle Park NC 27709
5. Soil Science Department; University of Manitoba; 362 Ellis Building Winnipeg MB Canada R3T 2N2
6. Department of Physics; North Carolina State University; Box 8202 Raleigh NC 27695-8202