https://www.archdaily.com/613066/difficult-run-residence-robert-m-gurney-architect
Difficult Run Residence / Robert M. Gurney Architect | ArchDaily
Mar 28, 2015 - Built by Robert M. Gurney Architect in McLean, United States Located in Mclean, Virginia, this project is sited on a seven acre, steeply sloping, wooded lot...
difficult runrobert mresidencegurneyarchitect
https://www.usgs.gov/media/images/synoptic-sampling-difficult-run-fairfax-virginia
Synoptic Sampling at Difficult Run in Fairfax, Virginia | U.S. Geological Survey
A USGS tech performs synoptic sampling at Difficult Run Above Fox Lake Near Fairfax, VA. Part of the Fairfax County Water Resources Monitoring Network.
virginia u sdifficult run