Institution: | 1. Department of Environmental Studies, Macalester College, 1600 Grand Ave., St. Paul, MN 55015, USA;2. Department of Biology, Macalester College, 1600 Grand Ave., St. Paul, MN 55015, USA;3. Department of Geology, Macalester College, 1600 Grand Ave., St. Paul, MN 55015, USA;4. St. Croix National Scenic Riverway, National Park Service, 401 North Hamilton St, St. Croix Falls, WI 54024, USA |