@misc{indiciae34fec5d40865,
  title = {Preliminary geologic map and sections of the Hogan 4 Northeast quadrangle, Lewis and Clark and Cascade Counties, Montana},
  author = {R. G. Schmidt and D. A. Swanson and Peter Zubovic},
  year = {1964},
  doi = {10.3133/i409},
  url = {https://pubs.usgs.gov/publication/i409},
  note = {Source identifier: i409}
}