@misc{indiciae91a9d2c42906,
  title = {Geology and mineral deposits of the San Cristobal district, Villa Martin province, Potosi, Bolivia},
  author = {Herbert S. Jacobson and Carlos Murillo and Lorgio Ruiz and Oscar Tapia and Hugo Zapata and Hugo Alarcon and Edgar Delgadillo and Carlos Velasco},
  year = {1969},
  doi = {10.3133/b1273},
  url = {https://pubs.usgs.gov/publication/b1273},
  note = {Source identifier: b1273}
}