>>10476734 pb

Reston VA and USGS blackhats dig, part 2

Sauce

https://twitter.com/USGS/status/1299406482090455043

https://archive.vn/S6xdW

https://www.worldcat.org/title/us-geological-survey-national-center-reston-virginia-status-report/oclc/3038739&referer=brief_results#similar

https://books.google.com/books?id=tS_nyX28P3kC

https://pubs.er.usgs.gov/publication/70160010

>>10491551

ps watch the water

https://water.usgs.gov/

>>10491564

>>10491514