@misc{indiciae1b245403cf3f,
  title = {Subsurface geologic cross sections of Mesozoic rocks in northeastern Colorado},
  author = {R.W. Blair},
  year = {1951},
  doi = {10.3133/oc42},
  url = {https://pubs.usgs.gov/publication/oc42},
  note = {Source identifier: oc42}
}