@misc{indiciaeee7b438e3370,
  title = {Paleocene and lower Eocene units in the southern part of the Piceance Creek basin, Colorado},
  author = {John R. Donnell},
  year = {1969},
  doi = {10.3133/b1274m},
  url = {https://pubs.usgs.gov/publication/b1274M},
  note = {Source identifier: b1274M}
}