@misc{indiciaec2ca9d03640c,
  title = {Reconnaissance of superficial phosphate deposit near Minas, Uruguay},
  author = {E.B. Eckel and C. Milton},
  year = {1953},
  doi = {10.2113/gsecongeo.48.6.437},
  url = {https://pubs.usgs.gov/publication/70207268},
  note = {Source identifier: 70207268}
}