@misc{indiciaea4415a325358,
  title = {Geologic map of the Sable Quadrangle, Adams and Denver Counties, Colorado},
  author = {R. M. Lindvall},
  year = {1980},
  doi = {10.3133/mf1180},
  url = {https://pubs.usgs.gov/publication/mf1180},
  note = {Source identifier: mf1180}
}