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(((("washita river" OR "fort cobb lake" OR "west barnitz creek" OR "cobb creek" OR "sugar creek") AND oklahoma) OR ((steiner OR matlock OR hillard OR starks OR heathman) AND oklahoma)) AND ((watershed OR benchmark) OR ((ars OR "agricultural research") AND benchmark) OR hydro OR model OR gage) OR (ars AND stewards)) NOT Mahantango
Remove constraint All Fields: (((("washita river" OR "fort cobb lake" OR "west barnitz creek" OR "cobb creek" OR "sugar creek") AND oklahoma) OR ((steiner OR matlock OR hillard OR starks OR heathman) AND oklahoma)) AND ((watershed OR benchmark) OR ((ars OR "agricultural research") AND benchmark) OR hydro OR model OR gage) OR (ars AND stewards)) NOT Mahantango
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