@misc{indiciaed429bf219d59,
  title = {Middle Paleozoic sedimentary phosphate in the Pensacola Mountains, Antarctica},
  author = {J.B. Cathcart and D. L. Schmidt},
  year = {1977},
  doi = {10.3133/pp456e},
  url = {https://pubs.usgs.gov/publication/pp456E},
  note = {Source identifier: pp456E}
}