@misc{indiciae6a050483ae8f,
  title = {Natural toxic waters of Poas Volcano, Costa Rica},
  author = {Susan L. Brantley and Gary L. Rowe and Leonard F. Konikow and Ward E. Sanford},
  year = {1992},
  url = {https://pubs.usgs.gov/publication/70073368},
  note = {Source identifier: 70073368}
}