@misc{indiciaef068d53b62d2,
  title = {Progress report, Colorado Front Range area},
  author = {Members of the Engineering Geology and Ground Water Branches, U.S. Geological Survey},
  year = {1951},
  doi = {10.3133/ofr5151},
  url = {https://pubs.usgs.gov/publication/ofr5151},
  note = {Source identifier: ofr5151}
}