Two scientists collect a sediment core from the Root River at Grange Avenue in Greenfield, Wisconsin
Two scientists collect a sediment core from the Root River at Grange Avenue in Greenfield, WisconsinBiologist Pat Perner (USGS Upper Midwest Environmental Science Center, left) and Field Assistant Justin Peschman (UMid WSC, right) collect a sediment core from the Root River at Grange Avenue in Greenfield, Wisconsin. https://waterdata.usgs.gov/monitoring-location/04087214/