@misc{indiciaee8a4fd904df7,
  title = {Composition of Pacific Ocean ferromanganese nodules},
  author = {David Z. Piper and M.E. Williamson},
  year = {1977},
  doi = {10.1016/0025-3227(77)90036-6},
  url = {https://pubs.usgs.gov/publication/70208057},
  note = {Source identifier: 70208057}
}