@misc{indiciaec0efcc061e8e,
  title = {Preliminary report on the engineering geology of the Eldorado Springs quadrangle, Boulder and Jefferson Counties, Colorado},
  author = {Maxwell E. Gardner},
  year = {1969},
  doi = {10.3133/ofr69102},
  url = {https://pubs.usgs.gov/publication/ofr69102},
  note = {Source identifier: ofr69102}
}