@misc{indiciaeb1ba1a7730f5,
  title = {Tritium/Helium-3 Apparent Ages of Shallow Ground Water, Portland Basin, Oregon, 1997-98},
  author = {Stephen R. Hinkle},
  year = {2009},
  doi = {10.3133/sir20095057},
  url = {https://pubs.usgs.gov/publication/sir20095057},
  note = {Source identifier: sir20095057}
}