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.
Dr. Phillip van Mantgem extracts a core sample from a ponderosa pine (Pinus ponderosa) that has experienced
prescribed fire in Lassen National Park, CA.
Public Domain.
