Search Results for the EPA National Library Catalog

Items Found: 8

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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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