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1. National Geochemical Survey database [USGS-NGS-database]
The USGS, in collaboration with other federal and state government agencies, industry, and academia, is conducting the National Geochemical Survey (NGS) to produce a body of geochemical data for the ...

2. An Online Interactive Map Service for Displaying Ground Water Conditions in Arizona [USGS_azgwconditions]
Monitoring the availability of the nation's ground-water supplies is of critical importance to planners and water managers. The general public also has an interest in understanding the status of ground-water ...

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