@misc{indiciaed75214c3de67,
  title = {Preliminary engineering geologic map of the Morrison quadrangle, Jefferson County, Colorado},
  author = {Howard E. Simpson and Stephen S. Hart},
  year = {1980},
  doi = {10.3133/ofr80654},
  url = {https://pubs.usgs.gov/publication/ofr80654},
  note = {Source identifier: ofr80654}
}