Engraved Copper Map Plate
![Image: Engraved Copper Map Plate](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/copper_plate__StL_and_Ill__engravings_highlighted.jpg?itok=Fkx58_1t)
Detailed Description
The USGS is offering surplus engraved copper plates for sale through government auction.
Sources/Usage
Public Domain.
The USGS is offering surplus engraved copper plates for sale through government auction.
Public Domain.