@misc{indiciaeedf83fc4c9a5,
  title = {Lacustrine manganese; a supplement to U.S. Geological Survey Bulletin 1693},
  author = {Keith R. Long and J. C. Wynn and F. Fritz and J. Corbett},
  year = {1992},
  doi = {10.3133/ofr92239},
  url = {https://pubs.usgs.gov/publication/ofr92239},
  note = {Source identifier: ofr92239}
}