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((("south fork" OR "tipton creek" OR "iowa rver" OR "minerva creek" OR "west branch iowa river" OR "east branch iowa river" OR "beaver creek" OR tomer OR moorman OR rossi) AND ((watershed? OR benchmark?) OR ((ars OR "agricultural research") AND benchmark) OR hydro OR model OR gage) AND iowa) OR (ars AND stewards)) NOT Mahantango
Remove constraint All Fields: ((("south fork" OR "tipton creek" OR "iowa rver" OR "minerva creek" OR "west branch iowa river" OR "east branch iowa river" OR "beaver creek" OR tomer OR moorman OR rossi) AND ((watershed? OR benchmark?) OR ((ars OR "agricultural research") AND benchmark) OR hydro OR model OR gage) AND iowa) OR (ars AND stewards)) NOT Mahantango
Topic
Best management practices (Pollution prevention)
Remove constraint Topic: Best management practices (Pollution prevention)
Topic
Water quality
Remove constraint Topic: Water quality
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