External Links
Noble Gas Laboratory, Lamont-Doherty Earth Observatory
http://www.ldeo.columbia.edu/~noblegas
NWQL Technical Memorandum 97-04 (with link to supplemental material) on Tritium/Helium-3 dating
http://wwwnwql.cr.usgs.gov/Public/tech_memos/nwql.97-04.html
Alternative Fluorocarbons Environmental Acceptability Study
http://www.afeas.org
ALE/GAGE/AGAGE Network
http://cdiac.esd.ornl.gov/ndps/alegage.html
NOAA Climate Modeling and Diagnostics Laboratory
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 Interest Group
http://wwwrcamnl.wr.usgs.gov/isoig
Reston Stable Isotope Laboratory -- Isotope Fractionation Project
http://isotopes.usgs.gov
