USDA UV-B Monitoring and Research Program, Colorado State University 419 Canyon Avenue, Suite 226, Fort Collins, CO 80521-2671, United States
USDA UV-B Monitoring and Research Program, Colorado State University 419 Canyon Avenue, Suite 226, Fort Collins, CO 80521-2671, United States
Illinois State Water Survey, MC-674, Department of Natural Resources and University of Illinois at Urbana-Champaign 2204 Griffith Dr., Champaign, IL 61820-7495, United States
USDA Cooperative State Research, Education and Extension Service, Waterfront Center 800 Ninth Street, SW, Washington, DC 20250-2220, United States