@misc{indiciaea1bbe779b16d,
  title = {Mineral deposit grade-tonnage models II},
  author = {D.L. Mosier},
  year = {1983},
  doi = {10.3133/ofr83902},
  url = {https://pubs.usgs.gov/publication/ofr83902},
  note = {Source identifier: ofr83902}
}