 
GIS tools and applications used for the monitoring of soil and underground water
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      |   | About GIS | 
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|  | Free, downloadable GIS software (GRASS GIS) | 
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|   | Free, downloadable GIS viewers (ArcGIS Explorer, ArcReader) | 
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|   | Introduction to GIS and Hydrologic modeling using ArcView 3.x | 
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