@misc{indiciae2de2a4dab874,
  title = {Borehole magnetometry; detection of a steel liner from a nearby observation borehole},
  author = {P. H. Nelson},
  year = {1990},
  doi = {10.3133/ofr90492},
  url = {https://pubs.usgs.gov/publication/ofr90492},
  note = {Source identifier: ofr90492}
}