@misc{indiciaeabdcef963a4d,
  title = {Instructions for sampling in geochemical prospecting},
  author = {H. E. Hawkes},
  year = {1953},
  doi = {10.3133/ofr53105},
  url = {https://pubs.usgs.gov/publication/ofr53105},
  note = {Source identifier: ofr53105}
}