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.
The chronology of their production is explained under the photo, the colors of the box are related to the colors of the arrows or of the removals on the artifact.
