@misc{indiciae9813cfc8017c,
  title = {Geology and oil and gas prospects of northeastern Colorado},
  author = {K.F. Mather and James Gilluly and R.G. Lusk},
  year = {1928},
  doi = {10.3133/b796b},
  url = {https://pubs.usgs.gov/publication/b796B},
  note = {Source identifier: b796B}
}