Affiliation: | 1. Acoustical Consultant, 3404 Roxford Dr., Champaign, IL, 61822 USA;2. Kaibab National Forest, U.S. Forest Service, North Kaibab Ranger District, 430 S. Main St., Fredonia, AZ, 86022 USA;3. Construction Engineering Research Laboratory, U.S. Army Engineer Research and Development Center, 2902 Newmark Dr., Champaign, IL, 61822 USA |