@misc{indiciae038796bce85d,
  title = {Marine phosphorite deposits - economic considerations},
  author = {James Bachelder Cathcart},
  year = {1967},
  doi = {10.3133/ofr6741},
  url = {https://pubs.usgs.gov/publication/ofr6741},
  note = {Source identifier: ofr6741}
}