@misc{indiciae753ae1ba22e4,
  title = {Pg-wave data-base tabulation from recordings made by vertical short-period systems on the LRSM and New England networks},
  author = {A. F. Espinosa and J. A. Michael},
  year = {1983},
  doi = {10.3133/ofr83590},
  url = {https://pubs.usgs.gov/publication/ofr83590},
  note = {Source identifier: ofr83590}
}