_:genid1 . _:genid1 "NSIDC-0107" . _:genid2 . _:genid2 . _:genid2 "-72.28"^^ . _:genid2 "-72.28"^^ . _:genid2 "106.48"^^ . _:genid2 "106.48"^^ . _:genid3 . _:genid3 . "nsidc-0107" . "Concentration and Isotopic Composition of O2 and N2 in Trapped Gases of the Vostok Ice Core"^^ . "10.7265/N5862DCW" . _:genid1 . . "These data describe the d18O of O2, d15N of N2, d18Oatm, and O2/N2 ratios of trapped gases in the Vostok ice core from East Antarctica. The investigator used a mass spectrometer to measure gas concentrations and isotopic compositions. Data extend to approximately 420,000 years ago. Two different age models are included. Data are available in tab-delimited ASCII format via ftp."^^ . "2002-01-01T00:00:00"^^ . _:genid2 . _:genid3 . . _:genid4 . _:genid4 . _:genid4 . _:genid4 . "oai:nsidc/NSIDC-0107" . "http://nsidc.org/api/dataset/2/oai?verb=GetRecord&metadataPrefix=dif&identifier=oai:nsidc/NSIDC-0107" . .