1. Northern Prairie Wildlife Research Center U.S. Geological Survey Jamestown North Dakota USA
2. Office of Research and Development U.S. Environmental Protection Agency Washington D.C. USA
3. Office of Research and Development U.S. Environmental Protection Agency Las Vegas Nevada USA
4. Department of Geological Sciences University of Manitoba Winnipeg Manitoba CAN
5. Office of Water U.S. Environmental Protection Agency Washington D.C. USA
6. Office of Research and Development U.S. Environmental Protection Agency Cincinnati Ohio USA
7. National Wetlands Inventory U.S. Fish and Wildlife Service Falls Church Virginia USA