@misc{indiciae76fc8a630ab7,
  title = {Map showing altitude of the top of the "Dakota Sandstone," Montana},
  author = {Richard D. Feltis},
  year = {1982},
  doi = {10.3133/wri824036},
  url = {https://pubs.usgs.gov/publication/wri824036},
  note = {Source identifier: wri824036}
}