@misc{indiciae1be8dfb2efa5,
  title = {Chemical composition of ferromanganese crusts in the world ocean: a review and comprehensive database},
  author = {Frank T. Manheim and Candice M. Lane-Bostwick},
  year = {1989},
  doi = {10.3133/ofr8920v.1.1},
  url = {https://pubs.usgs.gov/publication/ofr8920},
  note = {Source identifier: ofr8920}
}