Boulder Geomagnetic Observatory
![Image: Boulder Geomagnetic Observatory](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/Boulder.jpg?itok=JxqElPed)
Detailed Description
The Boulder magnetic observatory. Variations and Proton Sensor buildings at the lower right.
Sources/Usage
Public Domain.
The Boulder magnetic observatory. Variations and Proton Sensor buildings at the lower right.
Public Domain.