@misc{indiciae53e1a221b2d1,
  title = {Gravity and aeromagnetic studies of the Powder River basin and surrounding areas, southeastern Montana, northeastern Wyoming, and western South Dakota},
  author = {Stephen L. Robbins},
  year = {1994},
  doi = {10.3133/b1917r},
  url = {https://pubs.usgs.gov/publication/b1917R},
  note = {Source identifier: b1917R}
}