@misc{indiciaedd12c91def05,
  title = {Preliminary engineering geologic map of the Golden quadrangle, Jefferson County, Colorado},
  author = {M.E. Gardner and H. E. Simpson and S.S. Hart},
  year = {1971},
  doi = {10.3133/mf308},
  url = {https://pubs.usgs.gov/publication/mf308},
  note = {Source identifier: mf308}
}