Public domain
Geological Survey. Washington, D.C., Mar. 13. The offset camera making and copying maps, charts, and diagrams. This is used to change the size and makes the different plates for the different colors used on the maps
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineGeological Survey. Washington, D.C., Mar. 13. The offset camera making and copying maps, charts, and diagrams. This is used to change the size and makes the different plates for the different colors u. 1937-01-01. Harris & Ewing. Harris & Ewing Collection, Library of Congress. Public domain.
