MBL Stable Isotope Laboratory
Stable Isotope Lab for the analysis of nitrogen 15 and carbon 13 located at The Ecosystems Center at the Marine Biological Laboratory in Woods Hole, Massachusetts, USA
http://ecosystems.mbl.edu/silab/

Cambridge Isotope Laboratories
Cambridge Isotope Laboratories, Inc (CIL) is the world's premier producer of stable isotope labeled compounds and the world leader in the field of stable isotope separations. CIL has the most complete product offering of stable isotope labeled compounds available.
http://www.isotope.com/

Stable Isotope Lab Home
The Stable Isotope Lab studies past and present climate change.
http://mysticplum.colorado.edu/groups/sil/index.html

ISOGEOCHEM
Information about the e-mail discussion list for stable isotope geochemistry. Includes many isotope-related links including available positions, research laboratories, short course and workshop listings, and a searchable message archive.
http://www.eeb.cornell.edu/isogeochem/

Stable Isotope Analysis from Iso-Analytical
Iso-Analytical specialises in providing stable isotope analysis of the light elements (hydrogen, carbon, nitrogen, oxygen and sulfur) by isotope ratio mass spectrometry.
http://www.iso-analytical.com/

Isotech Laboratories, Inc. (Champaign, Il.)
The largest private stable isotope laboratory in the western hemisphere specializing in high-precision carbon, hydrogen, oxygen, nitrogen, and sulfur isotope analysis.
http://www.isotechlabs.com/

The Center for Applied Isotope Studies
The University of Georgia's Center for Applied Isotope Studies (CAIS) is a multidisciplinary organization dedicated to research and development of nuclear analytical technology.
http://www.uga.edu/~cais/

UCDavis Stable Isotope Facility
UCDavis Stable Isotope Facility. Analysis of stable isotopes of several light elements [H,C,N,O].
http://stableisotopefacility.ucdavis.edu/

Isotope Explorer
Nuclear data software.
http://ie.lbl.gov/isoexpl/isoexpl.htm

ChemGlobe: Seaborgium
The chemical element [Sg] - Seaborgium - Datasheet
http://partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/106.html