@misc{indiciae3a4d813d1cd9,
  title = {Geologic map of the Leadville 1 degree by 2 degrees Quadrangle, northwestern Colorado},
  author = {Ogden Tweto and R. H. Moench and J. C. Reed},
  year = {1978},
  doi = {10.3133/i999},
  url = {https://pubs.usgs.gov/publication/i999},
  note = {Source identifier: i999}
}