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((ars OR "agricultural research") AND (benchmark? OR stewards) OR ("beasley lake" OR "choptank river" OR "goodwin creek" OR "leon river" OR "little river" OR "north walnut creek" OR "st. joseph river" OR "salt river" OR "mark twain" OR ("south fork" AND "iowa") OR "town brook" OR "upper big Walnut creek" OR "upper washita river" OR "yalobusha river" OR "mahantango creek" OR "goodwater creek") NOT grape?)
Remove constraint All Fields: ((ars OR "agricultural research") AND (benchmark? OR stewards) OR ("beasley lake" OR "choptank river" OR "goodwin creek" OR "leon river" OR "little river" OR "north walnut creek" OR "st. joseph river" OR "salt river" OR "mark twain" OR ("south fork" AND "iowa") OR "town brook" OR "upper big Walnut creek" OR "upper washita river" OR "yalobusha river" OR "mahantango creek" OR "goodwater creek") NOT grape?)
Topic
water pollution
Remove constraint Topic: water pollution
Format
Article OR Electronic OR Journal
Remove constraint Format: Article <strong class='text-muted constraint-connector'>OR</strong> Electronic <strong class='text-muted constraint-connector'>OR</strong> Journal