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.
Reston Stable Isotope Laboratory: Report of Stable Isotopic Composition Reference Material USGS49-0.25 µL Antarctic Ice-core Water (hydrogen and oxygen isotopes in water)
Public Domain.
