W. F. Hardt

• Analysis of ground-water system in Orange County, California, by use of an electrical analog model
• Development and use of a mathematical model of the San Bernardino Valley ground-water basin, California
• Hydrologic analysis of Mojave River Basin, California, using electric analog model
• Mojave River Basin ground-water recharge with particular reference to the California floods of January and February, 1969
• Selected data on water wells, geothermal wells, and oil tests in Imperial Valley, California