@misc{indiciae103e7cd53bfd,
  title = {Preliminary complete Bouguer gravity anomaly map of the Butte 1 degree x 2 degree quadrangle, Montana},
  author = {Jerry H. Hassemer},
  year = {1984},
  doi = {10.3133/ofr8418},
  url = {https://pubs.usgs.gov/publication/ofr8418},
  note = {Source identifier: ofr8418}
}