@misc{indiciae43e08190ec1f,
  title = {Catalog of first motion focal mechanisms 1986-1987: Volume 1},
  author = {Russell E. Needham},
  year = {1990},
  doi = {10.3133/ofr88556a},
  url = {https://pubs.usgs.gov/publication/ofr88556A},
  note = {Source identifier: ofr88556A}
}