@misc{indiciae2d52d60366b9,
  title = {Structure contour map of the Big Horn Basin, Wyoming and Montana},
  author = {D. A. Andrews and William Gamewell Pierce and Jewell J. Kirby},
  year = {1944},
  doi = {10.3133/om3},
  url = {https://pubs.usgs.gov/publication/om3},
  note = {Source identifier: om3}
}