@misc{indiciaeee3ea70ff1d1,
  title = {Geology, geochemistry, and mineral resources of the upper Caura River area, Bolivar State, Venezuela},
  author = {G.B. Sidder and Felix Martinez},
  year = {1990},
  doi = {10.3133/ofr90231},
  url = {https://pubs.usgs.gov/publication/ofr90231},
  note = {Source identifier: ofr90231}
}