1. Institute of Outdoor Recreation and Tourism, Utah State University , 5215 Old Main Hill, Logan, UT 84322-5215 , USA
2. Department of Environment and Society, Utah State University , 5215 Old Main Hill, Logan, UT 84322-5215 , USA
3. USDA Forest Service, Pacific Southwest Research Station , 4955 Canyon Crest Drive, Riverside, CA 92507 , USA
4. USDA Forest Service, Pacific Northwest Research Station , 400 N. 34th Street, Suite 201, Seattle, WA 98103 , USA
5. University of Washington, School of Environmental and Forest Sciences , Box 352100, Seattle, WA 98195 , USA