@misc{indiciae5fcda1c4b8de,
  title = {Preliminary study of first motion from nuclear explosions recorded on seismograms in the first zone},
  author = {J. H. Healy and G. B. Mangan},
  year = {1963},
  doi = {10.3133/70039490},
  url = {https://pubs.usgs.gov/publication/70039490},
  note = {Source identifier: 70039490}
}