https://www.usgs.gov/media/images/usgs-chemist-collecting-a-sediment-core-mercury-analysis-ankobra-river-ghana
USGS chemist collecting a sediment core for mercury analysis, Ankobra River, Ghana | U.S....
USGS chemist Grace Armstrong collecting a sediment core for mercury analysis at the Kukuavile community along Ankobra River, Ghana.