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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
agricultural runoff
Remove constraint Topic: agricultural runoff
Topic
nitrate nitrogen
Remove constraint Topic: nitrate nitrogen
Topic
Escherichia coli
Remove constraint Topic: Escherichia coli
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