@misc{indiciaed50600d3ed43,
  title = {Bouguer gravity, aeromagnetic, and generalized geologic map of East Helena and Canyon Ferry quadrangles and part of the Diamond City quadrangle, Lewis and Clark, Broadwater, and Jefferson Counties, Montana},
  author = {W. E. Davis and W. T. Kinoshita and H.W. Smedes},
  year = {1963},
  doi = {10.3133/gp444},
  url = {https://pubs.usgs.gov/publication/gp444},
  note = {Source identifier: gp444}
}