@misc{indiciaeebcd2e3171f9,
  title = {The systematic geologic mapping program and a quadrangle-by-quadrangle analysis of time-stratigraphic relations within oil shale-bearing rocks of the Piceance Basin, western Colorado},
  author = {Ronald C. Johnson},
  year = {2012},
  doi = {10.3133/sir20125041},
  url = {https://pubs.usgs.gov/publication/sir20125041},
  note = {Source identifier: sir20125041}
}