@misc{indiciae4d6f4b48f9d6,
  title = {Taking the Earth's Pulse},
  author = {Robert L. Woodward and Harley Mitchell Benz and Kaye M. Shedlock and William M. Brown},
  year = {2000},
  doi = {10.3133/fs10397},
  url = {https://pubs.usgs.gov/publication/fs10397},
  note = {Source identifier: fs10397}
}