Isoseismal Map
![Isoseismal Map](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/thumbnails/image/1857_01_09_iso.gif?itok=2joBhCYD)
Detailed Description
Isoseismal Map abridged from Seismicity of the United States, 1568-1989 (Revised), by Carl W. Stover and Jerry L. Coffman, U.S. Geological Survey Professional Paper 1527, United States Government Printing Office, Washington: 1993.
Sources/Usage
Public Domain.