@misc{indiciae643afc810c1f,
  title = {Geologic map of the Ciudad Piar and part of the Ciudad Bolivar 2 degrees by 3 degrees quadrangles, Bolivar state, Venezuela},
  author = {John H. Stewart and Felix Martinez and William E. Brooks},
  year = {1994},
  doi = {10.3133/mf2246},
  url = {https://pubs.usgs.gov/publication/mf2246},
  note = {Source identifier: mf2246}
}