1. St. Croix Watershed Research Station, Science Museum of Minnesota; 16910 152nd St. N. Marine on St. Croix MN 55082
2. Three Rivers Park District; 3000 Xenium Ln. N. Plymouth MN 55441
3. Dep. of Bioproducts and Biosystems Engineering; Univ. of Minnesota; 1390 Eckles Ave. St. Paul MN 55108