@misc{indiciaeb4bacffc3b6c,
  title = {Ground-water resources of the Republic of El Salvador, Central America},
  author = {Albert Nelson Sayre and Gary Charles Taylor},
  year = {1951},
  doi = {10.3133/wsp1079d},
  url = {https://pubs.usgs.gov/publication/wsp1079D},
  note = {Source identifier: wsp1079D}
}