@misc{indiciae036c1d9eb7a1,
  title = {Geology and mineral resources of central Antioquia Department (Zone IIA), Colombia},
  author = {R.B. Hall and Jairo Alvarez A. and Hector Rico H.},
  year = {1973},
  doi = {10.3133/ofr7397},
  url = {https://pubs.usgs.gov/publication/ofr7397},
  note = {Source identifier: ofr7397}
}