Mansfield CA, Van Houtven GL, Johnson FR, Yang J. Do parents respond to ozone conditions? A comparison of children who have asthma and those who do not. Presented at the Environmental Protection Agency Science Forum; May 2005. Washington, DC.
Johnson FR, Mansfield CA, Yang J. Noise, congestion, pollution, and great scenery: visitor preferences for winter management options at yellowstone national park. Presented at the W1133 Meetings; February 2005. Salt Lake City, UT.