John O. Helgesen

• Appraisal of ground water for irrigation in the Little Falls area, Morrison County, Minnesota
• Assessment of nonpoint-source contamination of the High Plains aquifer in south-central Kansas, 1987
• Characterization of Ground-water Flow and Chemical Transport Beneath Two Irrigated Fields in South-central Kansas, 1988
• Ground-water appraisal of the Pineland Sands area, central Minnesota
• Hydrogeology and ground-water-quality conditions at the Harvey County Landfill, south-central Kansas, 1990
• Hydrology of the Great Plains aquifer system in Nebraska, Colorado, Kansas, and adjacent areas
• Surface-water-quality assessment of the lower Kansas River Basin, Kansas and Nebraska
• Surface-water-quality assessment of the lower Kansas River basin, Kansas and Nebraska
• Surface-Water-Quality Assessment of the Lower Kansas River Basin, Kansas and Nebraska
• Water resources of the Little Fork River watershed, northeastern Minnesota
• Water resources of the Mississippi and Sauk rivers watershed, central Minnesota