Lithographic Printing Stones for Map-making
![Image: Lithographic Printing Stones for Map-making](https://d9-wret.s3.us-west-2.amazonaws.com/assets/palladium/production/s3fs-public/styles/full_width/public/copper_plates__litho_stones.jpg?itok=hYu1Tf-t)
Detailed Description
In the past, each USGS topographic map typically required 3 individual lithographic stones for printing, one for each color shown on the map.
Sources/Usage
Public Domain.
In the past, each USGS topographic map typically required 3 individual lithographic stones for printing, one for each color shown on the map.
Public Domain.