Boulder Magnetic Observatory
![The Boulder magnetic observatory. Variations and Proton Sensor buildings at the lower right.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/Boulder_half_size.jpg?itok=kI-FQswC)
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.