@misc{indiciae85a4ecafe7e5,
  title = {Preliminary geochemical study of ash-flow tuffs in the Morococala and Los Frailes volcanic fields, central Bolivian tin belt},
  author = {G. E. Ericksen and R. L. Smith and R. G. Luedke and Mario Flores and Alfredo Espinosa and Fernando B. Urquidi and Fernando Saravia},
  year = {1985},
  doi = {10.3133/ofr85258},
  url = {https://pubs.usgs.gov/publication/ofr85258},
  note = {Source identifier: ofr85258}
}