@misc{indiciae4b916cb31c14,
  title = {Journal of Research of the U. S. Geological Survey, 1973, volume 1, issue 6},
  year = {1973},
  doi = {10.3133/70007399},
  url = {https://pubs.usgs.gov/publication/70007399},
  note = {Source identifier: 70007399}
}