@misc{indiciae934b6723f2dd,
  title = {Geologic map of parts of the San Gil and Malaga quadrangles (I-12 and I-13), Colombia},
  author = {D.E. Ward and Richard Goldsmith and J.B. Cruz and N.I. Tellez and L.C. Jaramillo},
  year = {1977},
  doi = {10.3133/i1007},
  url = {https://pubs.usgs.gov/publication/i1007},
  note = {Source identifier: i1007}
}