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.
Stacks of organized boxes containing trays of archived samples splits in the National Geochemical Sample Archive, Denver, CO.
Public Domain.
This image media is public domain.
