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Richard F Duwelius has written:

'Ground-water levels, flow, and quality in northwestern Elkhart County, Indiana, 1980-89' -- subject(s): Hydrogeology, Quality, Groundwater, Groundwater flow

'Water-resources programs and hydrologic-information needs, Marion County, Indiana, 1987' -- subject(s): Integrated water development, Water resources development

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10y ago

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