@misc{indiciae855e482f0653,
  title = {Geologic map of the Jefferson quadrangle, Park and Summit counties, Colorado},
  author = {Fred Barker and Donald Gray Wyant},
  year = {1976},
  doi = {10.3133/gq1345},
  url = {https://pubs.usgs.gov/publication/gq1345},
  note = {Source identifier: gq1345}
}