1. D.C. Drake Wisconsin Department of Natural Resources, Office of Great Waters, USGS Upper Midwest Environmental Science Center, 2630 Fanta Reed Rd, La Crosse, Wisconsin 54603
2. E.M. Lund Minnesota Department of Natural Resources, Lake City Field Station, 1801 S. Oak Street, Lake City, Minnesota 55041
3. R.M. Kreiling U.S. Geological Survey Upper Midwest Environmental Science Center, 2630 Fanta Reed Road, La Crosse, Wisconsin 54603