@misc{indiciae8d9b68ff90e7,
  title = {Mineralogy and composition of concentric layers within a manganese nodule from the North Pacific Ocean},
  author = {D.Z. Piper and M.E. Williamson},
  year = {1981},
  doi = {10.1016/0025-3227(81)90143-2},
  url = {https://pubs.usgs.gov/publication/70012156},
  note = {Source identifier: 70012156}
}