1. Resources for the Future; 1616 P Street NW; Washington; DC; 20036; USA
2. Northern Research Station; U.S. Forest Service; 1992 Folwell Ave; St. Paul; MN; 55108; USA
3. Institute of Entomology; Biology Centre of the Academy of Sciences of the Czech Republic; Branisovska 31; 37005; Ceske Budejovice; Czech Republic
4. AgResearch Lincoln; Cnr Springs Road and Gerald Street; Private Bag 4749; Christchurch; 8140; New Zealand
5. Northern Research Station; U.S. Forest Service; 180 Canfield St.; Morgantown; WV; 26505; USA