Boulder Magnetic Observatory
![Azimuth mark, Absolutes building and Coil building at Boulder magnetic observatory.](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/Boulder02_half_size.jpg?itok=9oI-sgZs)
Detailed Description
Azimuth mark, Absolutes building and Coil building at Boulder magnetic observatory.
Sources/Usage
Public Domain.
Azimuth mark, Absolutes building and Coil building at Boulder magnetic observatory.
Public Domain.