@misc{indiciae5df82b758f47,
  title = {Preliminary geologic map of the Denver 1? by 2? Quadrangle, north-central Colorado},
  author = {Bruce Bryant and L.W. McGrew and Reinhard A. Wobus},
  year = {1978},
  doi = {10.3133/ofr78397},
  url = {https://pubs.usgs.gov/publication/ofr78397},
  note = {Source identifier: ofr78397}
}