@misc{indiciae71ae37f723a7,
  title = {Measuring mercury and other elemental components in tree rings},
  author = {C. Gillan and W.A. Hollerman and T.W. Doyle and T.E. Lewis},
  year = {2004},
  url = {https://pubs.usgs.gov/publication/70026400},
  note = {Source identifier: 70026400}
}