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The atmospheric oxygen cycle: The oxygen isotopes of atmospheric
CO and O and the O/N ratio
Ralph F. Keeling
Scripps Institution of Oceanography, University of California,
San Diego, La Jolla, California
U.S. National Report to IUGG, 1991-1994
Rev. Geophys. Vol. 33
Suppl., © 1995 American Geophysical Union