@misc{indiciae09e2999448fe,
  title = {Phosphate rock in Colombia - a preliminary report, with a section on the phosphate occurrence at Turmeque},
  author = {James Bachelder Cathcart and Francisco Zambrano O. and Mojica G. Pedro E.},
  year = {1969},
  doi = {10.3133/b1272a},
  url = {https://pubs.usgs.gov/publication/b1272A},
  note = {Source identifier: b1272A}
}