id	keyword
american_scientific_journal-3279	nvzs
american_scientific_journal-3279	river
american_scientific_journal-3279	monitoring
american_scientific_journal-3279	nitrates
american_scientific_journal-3279	water
american_scientific_journal-3279	basins
american_scientific_journal-3279	surface
american_scientific_journal-3279	turkey
american_scientific_journal-3279	groundwater