@misc{indiciae9900d0efc647,
  title = {Eocene rocks in northeast Washington: Radiometric ages and correlation},
  author = {Robert Carl Pearson and John D. Obradovich},
  year = {1977},
  doi = {10.3133/b1433},
  url = {https://pubs.usgs.gov/publication/b1433},
  note = {Source identifier: b1433}
}