1. Department of Forest Ecosystems & Society Oregon State University Corvallis OR USA
2. Oregon State University Extension Service Redmond OR USA
3. Swiss Ornithological Institute Sempach Switzerland
4. School of Agriculture, Forest, & Food Sciences Bern University of Applied Sciences Zollikofen Switzerland
5. National Council for Air & Stream Improvement Anacortes WA USA
6. Weyerhaeuser Springfield OR USA
7. Department of Ecology & Evolutionary Biology Cornell University Ithaca NY USA
8. Department of Forest Engineering, Resources, & Management Oregon State University Corvallis OR USA