2012 Sparrow Mapper - Midwest thumbnail
![Screenshot of web map and map controls; shaded areas show total phosphorus levels in Midwest US streams](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/2012-SPARROW-mapper-Midwest-thumbnail.jpg?itok=PiSEm-MH)
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Thumbnail of 2012 Sparrow Mapper - Midwest
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Public Domain.
2012 Sparrow Mapper - Midwest
2012 SPARROW Models for the Midwest: Total Phosphorus, Total Nitrogen, Suspended Sediment, and Streamflow