@misc{indiciae32ecc941503d,
  title = {Structure contour map of the Big Horn Basin, Wyoming and Montana},
  author = {William Gamewell Pierce and D. A. Andrews and Jewell Kirby Keroher},
  year = {1947},
  doi = {10.3133/om74},
  url = {https://pubs.usgs.gov/publication/om74},
  note = {Source identifier: om74}
}