Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Wright Todd applies light-sensitive color solution to a base sheet on a photo lab whirler. This method was used for generating color-composite proofing of map separate registration.
Public Domain.
