@misc{indiciae771eb13adb20,
  title = {Stratigraphy of the Little Rocky Mountains and encircling foothills, Montana},
  author = {Maxwell McMichael Knechtel},
  year = {1959},
  doi = {10.3133/b1072n},
  url = {https://pubs.usgs.gov/publication/b1072N},
  note = {Source identifier: b1072N}
}