@misc{indiciae002d1ed13ada,
  title = {Geologic map and coal stratigraphic framework of the Paonia area, Delta and Gunnison counties, Colorado},
  author = {C.R. Dunrud},
  year = {1989},
  doi = {10.3133/coal115},
  url = {https://pubs.usgs.gov/publication/coal115},
  note = {Source identifier: coal115}
}