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.
Two size groups are visible in the retouched items. These two-dimensional groups belong to two different tool sets, i.e. the undifferentiated retouched tools and the small pointed tools.
