Isotopic Variations in Meteoric Waters.

@article{Craig1961IsotopicVI,
  title={Isotopic Variations in Meteoric Waters.},
  author={Harmon Craig},
  journal={Science},
  year={1961},
  volume={133 3465},
  pages={1702-3}
}
The relationship between deuterium and oxygen-18 concentrations in natural meteoric waters from many parts of the world has been determined with a mass spectrometer. The isotopic enrichments, relative to ocean water, display a linear correlation over the entire range for waters which have not undergone excessive evaporation. 
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