@misc{indiciaebf97270c680f,
  title = {Preliminary geologic map of the southwestern quarter of the Denver 1 degree x 2 degrees Quadrangle, Colorado},
  author = {Bruce Bryant and Reinhard A. Wobus},
  year = {1975},
  doi = {10.3133/ofr75340},
  url = {https://pubs.usgs.gov/publication/ofr75340},
  note = {Source identifier: ofr75340}
}