@misc{indiciae8d68ea4837a9,
  title = {On the standardization of geophysical observations at volcanoes},
  author = {J. P. Eaton},
  year = {1964},
  doi = {10.1007/bf02597542},
  url = {https://pubs.usgs.gov/publication/70209226},
  note = {Source identifier: 70209226}
}