@misc{indiciaea2b5c71a78eb,
  title = {Slides showing preliminary mosaic magnetic and complete Bouguer gravity anomaly maps of the Butte 1 by 2 degrees Quadrangle, Montana},
  author = {J. H. Hassemer and W. F. Hanna},
  year = {1982},
  doi = {10.3133/ofr82603},
  url = {https://pubs.usgs.gov/publication/ofr82603},
  note = {Source identifier: ofr82603}
}