@misc{indiciae9632709b3c60,
  title = {Preliminary structure contour map of the Bear's Den-Flat Coulee-Whitelash districts North Central, Montana},
  author = {C. E. Erdmann},
  year = {1930},
  doi = {10.3133/ofr301},
  url = {https://pubs.usgs.gov/publication/ofr301},
  note = {Source identifier: ofr301}
}