@misc{indiciaec5d03deb3f05,
  title = {Radiogenic helium in shallow groundwater within a clay till, southwestern Ontario},
  author = {Amy L. Sheldon and D. Kip Solomon and Robert J. Poreda and Andrew G. Hunt},
  year = {2003},
  doi = {10.1029/2002wr001797},
  url = {https://pubs.usgs.gov/publication/70025029},
  note = {Source identifier: 70025029}
}