@misc{indiciaeffb3aa5d2371,
  title = {Volcano hazards in the San Salvador region, El Salvador},
  author = {J. J. Major and S. P. Schilling and D.J. Sofield and C.D. Escobar and C.R. Pullinger},
  year = {2001},
  doi = {10.3133/ofr01366},
  url = {https://pubs.usgs.gov/publication/ofr01366},
  note = {Source identifier: ofr01366}
}