Illustration before edit by SPN
By USGS Publishing Information
October 2021 (approx.)
![Illustration before edit by SPN](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/media/images/Illustration_before.png?itok=bmez_kBv)
Detailed Description
Illustration before edit by SPN
Sources/Usage
Public Domain.
Illustration before edit by SPN
Public Domain.