@misc{1177356,
  author = {D R Belsher and R H McKaughlin and A G Repair and H E Bussey},
  title = {Microwave detection of lost wells and unknown water-filled voids in coal mines:},
  year = {1984},
  month = {1984-01-01 05:01:00},
  publisher = {, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.IR.84-3017},
  language = {en},
}