@misc{indiciaef88820289f32,
  title = {Comparison of the Wilfley concentration table and hand panning for concentration of heavy minerals prior to geochemical analysis},
  author = {William R. Greenwood and M.E. Koesterer and Steve Ludington and Donald A. Risoli},
  year = {1978},
  doi = {10.3133/ofr78712},
  url = {https://pubs.usgs.gov/publication/ofr78712},
  note = {Source identifier: ofr78712}
}