External Links
Environmental Tracer Group, Lamont-Doherty Earth Observatory
http://www.ldeo.columbia.edu/environmental-tracer-group
University of Utah Dissolved and Noble Gas Laboratory
http://www.noblegaslab.utah.edu/index.html
Alternative Fluorocarbons Environmental Acceptability Study
http://www.afeas.org
ALE/GAGE/AGAGE Network
http://cdiac.esd.ornl.gov/ndps/alegage.html
NOAA Earth System Research Laboratory, Global Monitoring Division
http://www.cmdl.noaa.gov
NOAA National Climatic Data Center
http://www.ncdc.noaa.gov
Environmental Isotope Laboratory, University of Waterloo
http://www.uweilab.ca
U.S. Geological Survey Isotope Tracers Project
http://wwwrcamnl.wr.usgs.gov/isoig
Reston Stable Isotope Laboratory -- Isotope Fractionation Project
http://isotopes.usgs.gov
GDAT intercomparison exercice on CFCs and SF6 tracers for groundwater dating
http://www.geosciences.univ-rennes1.fr/spip.php?article1233