A U.S. Geological Survey chemist evaporating sample extracts
By Environmental Health Program
2017 (approx.)
![A U.S. Geological Survey chemist evaporating sample extracts in laboratory hood to concentrate pesticide residues](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/ctt_hladik_scientist_at_hood_working_with_sample_extracts_1024.jpg?itok=QnLXfr61)
Detailed Description
Organic Chemistry Research Laboratory — Sacramento, California. USGS chemist working with samples in a laboratory hood
Sources/Usage
Public Domain.