@misc{indiciae570bf5339052,
  title = {Phosphate investigations in Colombia, 1969 a progress report; with a note on the aluminous laterite deposits of the Department of Cauca},
  author = {James Bachelder Cathcart},
  year = {1971},
  doi = {10.3133/ofr7165},
  url = {https://pubs.usgs.gov/publication/ofr7165},
  note = {Source identifier: ofr7165}
}