@misc{indiciae9c703d40e75f,
  title = {Annual precipitation in the Yellowstone National Park region since AD 1173},
  author = {Stephen T. Gray and Lisa J. Graumlich and Julio L. Betancourt},
  year = {2017},
  doi = {10.1016/j.yqres.2007.02.002},
  url = {https://pubs.usgs.gov/publication/70004008},
  note = {Source identifier: 70004008}
}