G. A. Irwin

• A water-quality reconnaissance of Big Bear Lake, San Bernardino County, California, 1972-1973
• Florida ground-water quality
• Reconnaissance study of selected nutrients, pesticides, and trace elements in the Eel, Salinas, and Santa Ana Rivers, California, October 1971 through July 1972
• Water-quality assessment of runoff from a rural highway bridge near Tallahassee, Florida
• Water-quality data for selected sites tributary to the Salton Sea, California, August 1969-June 1970
• Water-quality investigation, Eel River, California
• Water-quality investigation, Salinas River, California