@misc{indiciaecbaf5e946c12,
  title = {Map showing altitude of the top of the Eagle Sandstone, Montana},
  author = {Richard D. Feltis},
  year = {1982},
  doi = {10.3133/wri824034},
  url = {https://pubs.usgs.gov/publication/wri824034},
  note = {Source identifier: wri824034}
}