@misc{indiciaea9962c7c1c7e,
  title = {Geologic map of the Bucaramanga Quadrangle H-12, Colombia},
  author = {D.E. Ward and Richard Goldsmith and Andres V. Jimeno and Jaime B. Cruz and Hernan Restrepo and Eduardo R. Gomez},
  year = {1977},
  doi = {10.3133/i1005},
  url = {https://pubs.usgs.gov/publication/i1005},
  note = {Source identifier: i1005}
}