@misc{indiciaed9ad185141c8,
  title = {Geological and geochemical reconnaissance in the central Santander Massif, Departments of Santander and Norte de Santander, Colombia},
  author = {James George Evans},
  year = {1976},
  doi = {10.3133/ofr77281},
  url = {https://pubs.usgs.gov/publication/ofr77281},
  note = {Source identifier: ofr77281}
}