@misc{indiciae10005fb7e911,
  title = {Geologic map of the Ennis 30' x 60' quadrangle, Madison and Gallatin Counties, Montana, and Park County, Wyoming},
  author = {Karl S. Kellogg and Van S. Williams},
  year = {2000},
  doi = {10.3133/i2690},
  url = {https://pubs.usgs.gov/publication/i2690},
  note = {Source identifier: i2690}
}