@misc{indiciae29481dd288ce,
  title = {Mineral resources of the southern half of Zone III Santander, Norte de Santander and Boyaca, Colombia},
  author = {Dwight Edward Ward and Richard Goldsmith and Bruna B. Cruz and Jaime Restrepo and A. Hernan},
  year = {1970},
  doi = {10.3133/ofr70359},
  url = {https://pubs.usgs.gov/publication/ofr70359},
  note = {Source identifier: ofr70359}
}