Search Results for the EPA National Library Catalog

Items Found: 8
Showing: Items 1 - 8
Your Search: (AUTHOR=Helgesen AND John AND O)

Select Item Title Year Published
Appraisal of ground water for irrigation in the Little Falls area, Morrison County, Minnesota / 1973
Assessment of nonpoint-source contamination of the High Plains aquifer in south-central Kansas, 1987 1992
Characterization of ground-water flow and chemical transport beneath two irrigated fields in south-central Kansas, 1988 1990
Description of data files compiled for the Central Midwest Regional Aquifer-System Analysis 1989
Ground- and surface-water interaction between the Kansas River and associated alluvial aquifer, northeastern Kansas / 1993
Regional aquifers in Kansas, Nebraska, and parts of Arkansas, Colorado, Missouri, New Mexico, Oklahoma, South Dakota, Texas, and Wyoming--geohydrologic framework / 1993
Steady-state unsaturated-zone model to simulate pesticide transport 1991
Surface-water-quality assessment of the lower Kansas River basin, Kansas and Nebraska : results of investigations, 1987-90 / 1996

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