@misc{indiciae190c1f0d3358,
  title = {Mineral resources of parts of the Departments of Antioquia and Caldas, Zone II, Colombia},
  author = {R.B. Hall and Tomas Feininger and L. Barrero and Rico H. Dario and Hector and A. Alvarez},
  year = {1970},
  doi = {10.3133/ofr70148},
  url = {https://pubs.usgs.gov/publication/ofr70148},
  note = {Source identifier: ofr70148}
}