@misc{indiciaeac42f3c0ea37,
  title = {Preliminary geophysical report on selected geologic test sites},
  author = {Robert D. Regan},
  year = {1967},
  doi = {10.3133/ofr67186},
  url = {https://pubs.usgs.gov/publication/ofr67186},
  note = {Source identifier: ofr67186}
}