@misc{indiciaeb03d3850afc4,
  title = {Geology and mineral resources of the Zipaquira area (Zone IV), Cordillera Oriental, Colombia},
  author = {Donald H. McLaughlin and Marino Arce Herrera},
  year = {1972},
  doi = {10.3133/ofr72241},
  url = {https://pubs.usgs.gov/publication/ofr72241},
  note = {Source identifier: ofr72241}
}