1. The Morton Arboretum, 4100 Illinois Route 3, Lisle, IL 60532
2. DePaul University, 2320 N Kenmore Ave, Chicago, IL 60614 Present address: University of Connecticut, Department of Natural Resources and Environment Center for Environmental Science and Engineering, 1376 Storrs Road, Storrs, CT 06269
3. Forest Preserve District of Cook County, 536 North Harlem Avenue, River Forest IL 60305, River Forest, IL 60305 Present address: 807 Butterfield Court, Shorewood, IL 60404