@misc{indiciaef77e2ded1e3e,
  title = {Neogene-Quaternary volcanism and mineralization in the Central Andes},
  author = {G. E. Ericksen and V.R. Eyzaguirre and Fernando B. Urquidi and Raul O. Salas},
  year = {1987},
  doi = {10.3133/ofr87634},
  url = {https://pubs.usgs.gov/publication/ofr87634},
  note = {Source identifier: ofr87634}
}