@misc{indiciae29a6f15cacb9,
  title = {Map showing cumulative thickness of sandstone in the "Dakota Sandstone," Montana},
  author = {Richard D. Feltis},
  year = {1982},
  doi = {10.3133/wri824035},
  url = {https://pubs.usgs.gov/publication/wri824035},
  note = {Source identifier: wri824035}
}