@misc{indiciaecc5f78b15c2e,
  title = {Geologic map of the Hardy quadrangle, Cascade and Lewis and Clark Counties, Montana},
  author = {Kenneth S. Soward},
  year = {1976},
  doi = {10.3133/gq1241},
  url = {https://pubs.usgs.gov/publication/gq1241},
  note = {Source identifier: gq1241}
}