@misc{indiciae68d3cbcf4a6f,
  title = {Estimating usable resources from historical industry data},
  author = {S.M. Cargill and D. H. Root and E. H. Bailey},
  year = {1981},
  doi = {10.2113/gsecongeo.76.5.1081},
  url = {https://pubs.usgs.gov/publication/70207147},
  note = {Source identifier: 70207147}
}