@misc{indiciae87d0dbdb41bb,
  title = {The Geological Survey's work on development of prospecting tools, instruments, and techniques},
  author = {Frank Walter Stead},
  year = {1952},
  doi = {10.3133/tei211},
  url = {https://pubs.usgs.gov/publication/tei211},
  note = {Source identifier: tei211}
}