@misc{indiciae23aa10ec9472,
  title = {Hydrocarbon evaluation and structure contour map of part of the Choteau 1° x 2° quadrangle, Lewis and Clark, Teton, Powell, Missoula, Lake, Flathead and Cascade Counties, Montana},
  author = {Melville Rhodes Mudge and Jerry L. Clayton and Kathryn M. Nichols},
  year = {1980},
  doi = {10.3133/ofr8024},
  url = {https://pubs.usgs.gov/publication/ofr8024},
  note = {Source identifier: ofr8024}
}