1. The Morton Arboretum Center for Tree Science 4100 Illinois Route 53 Lisle IL 60532 USA
2. The University of Chicago Laboratory Schools 1362 East 59th St. Chicago IL 60637 USA
3. U.S. National Arboretum 3501 New York Ave NE Washington D.C. 20002 USA
4. The Field Museum 1400 S Lake Shore Drive Chicago IL 60605 USA