@misc{indiciaedfef969079b1,
  title = {Seismic profiling of geologic structures near Pierre, South Dakota},
  author = {Thomas C. Nichols and Donley S. Collins and Henri S. Swolfs},
  year = {1989},
  doi = {10.3133/ofr89224},
  url = {https://pubs.usgs.gov/publication/ofr89224},
  note = {Source identifier: ofr89224}
}