@misc{indiciaef0beeaf721fb,
  title = {Size analysis, visual estimation of phosphate and other minerals, and preliminary estimation of recoverable phosphate in size fractions of sediment samples from drillholes GAT-90, Tybee Island, and GAS-90-2, Skidaway Island, Georgia},
  author = {James R. Herring and Frank T. Manheim and Kathleen Farrell and Paul Huddlestun and Brian Bretz},
  year = {1991},
  doi = {10.3133/ofr91586},
  url = {https://pubs.usgs.gov/publication/ofr91586},
  note = {Source identifier: ofr91586}
}