Scientist conducts water quality sampling in the Difficult Run watersh
By Chesapeake Bay Activities
September 2011 (approx.)
![Scientist conducts water quality sampling in the Difficult Run watershed in Fairfax County, Virginia](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/difficult_run.png?itok=p9m0d1jU)
Detailed Description
USGS scientist conducts water quality sampling in the Difficult Run watershed in Fairfax County, Virginia.
Sources/Usage
Public Domain.