Geomagnetism Fredericksburg
![Brick signs for Fredericksburg Magnetic Observatory and National Ocean Service.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/usgswall.jpg?itok=UGkEm4Ez)
Detailed Description
Brick signs for Fredericksburg Magnetic Observatory and National Ocean Service.
Sources/Usage
Public Domain.
Brick signs for Fredericksburg Magnetic Observatory and National Ocean Service.
Public Domain.