@misc{indiciae821425bf7d5b,
  title = {Why did they quit?},
  author = {L. E. Holland Bartels and R.C. Hubley},
  year = {1988},
  doi = {10.1577/1548-8446-13-2},
  url = {https://pubs.usgs.gov/publication/1003444},
  note = {Source identifier: 1003444}
}